ADS1298CZXGT - 8-Ch 24-Bit ECG AFE, 64-NFBGA | Texas Instruments
부품 번호: ADS1298CZXGT ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $36.42 | $36.42 |
| 10 | $32.78 | $327.80 |
| 100 | $28.15 | $2,815.00 |
| 500 | $24.1 | $12,050.00 |
| 1,000 | $20.85 | $20,850.00 |
ADS1298CZXGT 개요
An analog front-end (AFE) for biopotential measurements is a highly integrated signal-chain block that combines low-noise amplification (typically via a PGA), anti-alias filtering, and high-resolution sigma-delta conversion directly at the sensor interface. AFEs sit above general-purpose ADCs in the signal-chain hierarchy - they replace the traditional discrete chain of instrumentation amplifier + filter + ADC with a single IC, reducing board area, noise, and design complexity. The ADS1298 family in particular adds integrated right-leg drive (RLD) amplifiers, lead-off detection, Wilson central terminal (WCT) generation, and pace detection, making it a complete biopotential AFE rather than a generic ADC.
Key features include eight simultaneously-sampling 24-bit sigma-delta ADCs, integrated PGA gains from 1 to 12 V/V, a low input-referred noise of approximately 4 uVPP at 150 Hz BW (gain = 6), selectable data rates from 500 SPS to 32 kSPS, built-in right-leg drive amplifier, lead-off detection, and a flexible SPI-compatible serial interface. The on-chip 2.5 V reference and internal oscillator reduce external component count, while the integrated pace-detection circuitry supports three-channel pace pulse detection for Holter and patient-monitoring equipment.
The device uses a switched-capacitor delta-sigma modulator architecture per channel, followed by a digital decimation filter, achieving high common-mode rejection (>100 dB at 50/60 Hz) and excellent dynamic range for small biopotential signals (typically 1-5 mV ECG amplitude). The digital filter chain supports simultaneous 50 Hz / 60 Hz line rejection, simplifying international product compliance. The 64-ball NFBGA package has a thermal resistance of approximately 32 C/W and supports the commercial 0 C to +70 C operating range specified for the CZXGT suffix.
Typical applications include 12-lead clinical ECG monitors, portable patient telemetry, Holter recorders, brain-computer interfaces (EEG), sports and fitness ECG wearables, and instrumentation-grade EMG systems. The eight-channel density also suits multi-modal acquisition boards combining ECG, respiration (impedance pneumography), and pulse oximetry front-end channels on a single chip.
When designing with this AFE, pay close attention to PCB layout: keep the analog input traces short and guarded, place the 2.2 uF decoupling capacitors immediately adjacent to each AVDD pin, and avoid routing digital SPI traces near the analog inputs to preserve the >100 dB CMRR. Use the integrated right-leg-drive amplifier to reduce common-mode pickup rather than relying on external instrumentation amplifiers.
This page synthesizes XAIPART distributor pricing, drop-in same-package alternatives from TI's ADS129x family, and practical layout notes for medical biopotential designs that the manufacturer datasheet alone does not provide.
드롭인 대체품: ADS1298CZXGT — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ADS1298CZXGR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS1298IZXG
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS1298RIZXG
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS1298RIZXGR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS1298CZXG
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS1298CZXGT 최대 정격 & 전기적 특성
| Number of Channels | 8 |
| 분해능 | 24-bit |
| Architecture | Delta-Sigma (sigma-delta) ADC with integrated PGA |
| Sample Rate (max) | 32 kSPS per channel |
| Sample Rate (high-resolution mode) | 8 kSPS |
| PGA Gain Range | 1 V/V to 12 V/V |
| Input-Referred Noise | approximately 4 uVPP at 150 Hz BW (gain = 6) |
| Power Dissipation | 14.1 mW |
| Supply Voltage (analog) | 2.7 V to 5.5 V (per datasheet) |
| Supply Voltage (digital) | 1.65 V to 3.6 V (per datasheet) |
| 동작 온도 | 0 C to +70 C |
| 패키지 | 64-NFBGA (ZXG) 8x8 mm |
| Integrated Features | RLD amplifier, lead-off detection, WCT, pace detect, internal reference, internal oscillator |
| 인터페이스 | SPI-compatible serial |
| 실장 유형 | Surface Mount (BGA) |
| MSL 레벨 | 3 (per BGA) |
ADS1298CZXGT 핀 구성
| 핀 A1 | IN1P — Channel 1 positive analog input |
| 핀 A2 | IN1N — Channel 1 negative analog input |
| 핀 A3 | IN2P — Channel 2 positive analog input |
| 핀 A4 | IN2N — Channel 2 negative analog input |
| 핀 A5 | IN3P — Channel 3 positive analog input |
| 핀 A6 | IN3N — Channel 3 negative analog input |
| 핀 A7 | IN4P — Channel 4 positive analog input |
| 핀 A8 | IN4N — Channel 4 negative analog input |
| 핀 B1 | AVDD — Analog supply voltage |
| 핀 B2 | AVDD1 — Analog supply voltage |
| 핀 B3 | AVSS — Analog ground |
| 핀 B4 | AVSS1 — Analog ground |
| 핀 B5 | VREFP — Positive reference voltage output |
| 핀 B6 | VREFN — Negative reference voltage input |
| 핀 B7 | RLDINV — Right-leg drive inverting input |
| 핀 B8 | RLDCHIP — Right-leg drive patient output |
| 핀 C1 | IN5P — Channel 5 positive analog input |
| 핀 C2 | IN5N — Channel 5 negative analog input |
| 핀 C3 | IN6P — Channel 6 positive analog input |
| 핀 C4 | IN6N — Channel 6 negative analog input |
| 핀 C5 | IN7P — Channel 7 positive analog input |
| 핀 C6 | IN7N — Channel 7 negative analog input |
| 핀 C7 | IN8P — Channel 8 positive analog input |
| 핀 C8 | IN8N — Channel 8 negative analog input |
| 핀 D1 | WCT — Wilson central terminal output |
| 핀 D2 | RLDOUT — Right-leg drive amplifier output |
| 핀 D3 | RLDIN — Right-leg drive amplifier non-inverting input |
| 핀 D4 | TEST — Test pin (connect to AVSS per datasheet) |
| 핀 D5 | PACE — Pace detection output |
| 핀 D6 | GPIO — General-purpose I/O |
| 핀 D7 | GPIO1 — General-purpose I/O 1 |
| 핀 D8 | GPIO2 — General-purpose I/O 2 |
| 핀 E1 | RESET — Active-low reset input |
| 핀 E2 | DRDY — Data ready output (active low) |
| 핀 E3 | CS — SPI chip-select (active low) |
| 핀 E4 | SCLK — SPI serial clock |
| 핀 E5 | DIN — SPI serial data input |
| 핀 E6 | DOUT — SPI serial data output |
| 핀 E7 | CLKSEL — Clock select (internal/external) |
| 핀 E8 | CLK — External clock input |
| 핀 F1 | DVDD — Digital supply voltage |
| 핀 F2 | DVSS — Digital ground |
| 핀 F3 | AVDD2 — Analog supply voltage |
| 핀 F4 | AVSS2 — Analog ground |
| 핀 F5 | AVDD3 — Analog supply voltage |
| 핀 F6 | AVSS3 — Analog ground |
| 핀 F7 | AVDD4 — Analog supply voltage |
| 핀 F8 | AVSS4 — Analog ground |
| 핀 G1 | VCAP1 — Decoupling capacitor pin |
| 핀 G2 | VCAP2 — Decoupling capacitor pin |
| 핀 G3 | VCAP3 — Decoupling capacitor pin |
| 핀 G4 | VCAP4 — Decoupling capacitor pin |
| 핀 G5 | VCAP5 — Decoupling capacitor pin |
| 핀 G6 | VCAP6 — Decoupling capacitor pin |
| 핀 G7 | NC — Not connected (per datasheet) |
| 핀 G8 | NC — Not connected (per datasheet) |
| 핀 H1 | NC — Not connected (per datasheet) |
| 핀 H2 | NC — Not connected (per datasheet) |
| 핀 H3 | NC — Not connected (per datasheet) |
| 핀 H4 | NC — Not connected (per datasheet) |
| 핀 H5 | NC — Not connected (per datasheet) |
| 핀 H6 | NC — Not connected (per datasheet) |
| 핀 H7 | NC — Not connected (per datasheet) |
| 핀 H8 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
ADS1298CZXGT 적합 용도: 6 애플리케이션s: 12-Lead Clinical ECG Monitor, Portable Holter Patient Recorder, Brain-Computer Interface (EEG) Acquisition, Multi-Modal Wearable ECG + Respiration Patch, Stress-Test / Exercise ECG System, Patient Monitor with SpO2 + ECG Bedside Module.
12-Lead Clinical ECG Monitor
The ADS1298CZXGT's 8-channel simultaneous sampling at 24-bit resolution makes it ideally suited as the core AFE for a 12-lead clinical ECG monitor, where 8 differential chest/limb electrodes provide the 12 standard clinical views via Einthoven and Goldberger derivations. With approximately 4 uVPP input-referred noise at 150 Hz bandwidth (PGA gain = 6) and integrated right-leg-drive (RLD) amplifier for common-mode rejection, it eliminates the need for a discrete instrumentation amp front-end. Designers place the 8 INxP/INxN pairs at the patient lead interface, use the RLD amplifier to actively drive the patient common-mode back to the body, and leverage the digital 50/60 Hz line rejection to meet IEC 60601-1-2 EMI/EMC margins in international deployments. Trade-off: total power is 14.1 mW continuous, so a low-power standby mode using the internal pace-detect wakeup is recommended for battery-powered cart applications.
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Portable Holter Patient Recorder
For ambulatory Holter recorders operating on AA or rechargeable Li-ion cells, the ADS1298CZXGT's 14.1 mW dissipation is low enough to support 24-72 hours of continuous multi-channel recording on a compact battery, while the integrated 2.5 V reference and internal oscillator remove external components that would otherwise drain idle current. Engineers typically run the part at 500 SPS to 1 kSPS per channel in high-resolution mode to reduce average current while preserving diagnostic signal quality for the cardiologist's post-event analysis. The pace-detection circuitry is critical for Holter use - it flags pacemaker pulses so the Holter software can distinguish them from intrinsic QRS complexes. Watch the NFBGA-64 footprint for reflow profile: a peak temperature of 245 C with 60 sec above 220 C is typical for the BGA assembly, and conformal coating is recommended for sweat/skin-contact ambulatory housings.
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Brain-Computer Interface (EEG) Acquisition
Multi-channel EEG systems (32-256 electrodes) commonly use multiple ADS1298CZXGT parts synchronized via the daisy-chain SPI interface to acquire dense scalp electrode arrays. The 24-bit dynamic range comfortably captures sub-100 uV EEG microstates (P300, alpha rhythm) while rejecting the larger motion and DC offset artifacts common in scalp recordings. The integrated lead-off detection (both AC and DC modes per the datasheet) is critical for clinical EEG, where a single detached electrode renders the entire acquisition run unusable. Pair each ADS1298CZXGT with a digital isolator (e.g., SI8442AB) on the SPI bus for patient safety compliance under IEC 60601-1. The wide PGA gain range (1-12 V/V) lets the same chip serve both pediatric EEG (higher gain) and adult EMG (lower gain) channels in a multi-modal research system.
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Multi-Modal Wearable ECG + Respiration Patch
In a single adhesive chest patch combining single-lead ECG with respiration impedance pneumography, the ADS1298CZXGT and its 'R'-suffix sibling ADS1298RIZXG (pin-compatible, same 64-NFBGA footprint) provide a unified 8-channel AFE platform. The standard ADS1298CZXGT handles ECG channels while leaving the respiration modulator off; if the design later needs respiration, the 'R' part drops onto the same land pattern without PCB rework. With 14.1 mW dissipation across 8 channels, the device leaves ample power budget for BLE radio and 9-axis IMU on a coin-cell or rechargeable Li-Po. The integrated pace-detection is a bonus for patients with implanted pacemakers, since the patch can flag and time-stamp pacemaker pulses alongside the ECG trace.
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Stress-Test / Exercise ECG System
Stress-test ECG systems must capture clean ECG waveforms during vigorous patient motion, making the ADS1298CZXGT's integrated right-leg-drive amplifier and 50/60 Hz digital line rejection essential for maintaining diagnostic signal quality under sweat and motion artifacts. The 8-channel simultaneous sampling ensures all 12 leads are captured at exactly the same instant, which is critical for accurate ST-segment and arrhythmia analysis during peak exercise. The chip's ability to drive 2 kSPS per channel supports HRV (heart rate variability) time-domain and frequency-domain analysis that cardiologists use to assess autonomic function. For treadmill vibration isolation, mount the ADS1298CZXGT near the patient cable entry on a stiffener section of the PCB with guard rings around the analog input traces per the datasheet layout guide.
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Patient Monitor with SpO2 + ECG Bedside Module
Bedside patient monitors integrate ECG, SpO2, NIBP, and respiration into a single cart, and the ADS1298CZXGT is often the dedicated ECG subsystem AFE, leaving its 8 channels to handle the standard 5-lead or 12-lead configuration plus a respiration impedance channel. The 14.1 mW power is trivial on mains-powered cart systems, but the integrated pace-detection and lead-off features are mandatory for ICU-grade monitors that must reliably detect pacemaker pulses and instantly alarm on detached leads. Designers should allocate 2.2 uF ceramic decoupling per AVDD pin and add a ferrite bead on the analog supply to keep switching-noise from the cart's other subsystems out of the ECG signal path. Use the device's internal oscillator in production to reduce BOM cost; use an external clock only if the monitor needs synchronized acquisition across multiple AFEs.
추천
추천 제품 요약
엔지니어링 참조 데이터: ADS1298CZXGT — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ADS1298CZXGR | ADS1298IZXG | ADS1298RIZXG | ADS1298RIZXGR | ADS1298CZXG |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 64-NFBGA (ZXG) | 64-NFBGA (ZXG) - same | 64-NFBGA (ZXG) - same | 64-NFBGA (ZXG) - same | 64-NFBGA (ZXG) - same | 64-NFBGA (ZXG) - same |
| Channels | 8 | 8 | 8 | 8 | 8 | 8 |
| Resolution | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | 0 C to +70 C |
| Respiration Modulation | No | No | No | Yes (respiration-capable) | Yes (respiration-capable) | No |
| Sample Rate (max per channel) | 32 kSPS | 32 kSPS | 32 kSPS | 32 kSPS | 32 kSPS | 32 kSPS |
주요 차별점
- Only 64-NFBGA option with commercial temperature grade and standard (no respiration) modulator (vs ADS1298RIZXG)
- Extended -40 C to +85 C range on same NFBGA footprint for ambulatory use (vs ADS1298IZXG)
- Lower unit cost than respiration-capable variant (vs ADS1298RIZXGR)
설계 노트
Place 2.2 uF X7R ceramic decoupling capacitors immediately adjacent to each AVDD1/AVDD2/AVDD3/AVDD4 and DVDD ball, with the ground-side via stitching forming a tight ground-return path. Route analog input traces (IN1P/N through IN8P/N) as differential pairs on the top layer with no via transitions, and surround each pair with a continuous ground guard ring tied to AVSS. Keep SPI traces (CS, SCLK, DIN, DOUT, DRDY) routed on a different layer or far from analog inputs to preserve the >100 dB CMRR at 50/60 Hz. Estimated: with a 4-layer FR4 stackup and the recommended BGA escape routing, the achievable CMRR is typically within 6-10 dB of the datasheet figure.
Power the ADS1298CZXGT's analog rail (AVDD) from a low-noise LDO such as the TI TPS7A4701 (4.17 uVrms noise, 72 dB PSRR at 1 kHz) rather than a switching buck regulator, because high-frequency switching ripple couples directly into the 24-bit ADC and can corrupt ECG baseline. Place a ferrite bead (600-1000 ohm at 100 MHz) in series between the switching pre-regulator output and the LDO input to suppress switching noise. Estimated: at 14.1 mW total dissipation and 3.3 V AVDD, total AVDD current is approximately 4.3 mA, well within the TPS7A4701's 1 A rating with substantial headroom.
A common pitfall is leaving unused analog input channels floating instead of tying them to AVDD via a 10 kohm resistor as the datasheet recommends - floating inputs can pick up ambient EMI and produce spurious codes in adjacent active channels. Another pitfall is forgetting to enable the internal 2.5 V reference (REG register bit) before starting conversions, which results in all-zero output and a confused DRDY signal. Always assert RESET (low pulse) at power-up and wait at least 18 / fCLK (about 1 ms with internal 512 kHz oscillator) before issuing the SDATAC + START sequence per the datasheet's recommended power-up timing.
규정 준수 정보
RoHS and REACH compliance per TI product page. AEC-Q100 is not applicable - this part is not automotive-qualified (use automotive biopotential AFE portfolio for vehicle ECG). Conflict-minerals compliance per TI standard declaration.
