AD7656YSTZ-1-RL - 16-Bit, 250kSPS 6-Ch Bipolar ADC | ADI
MPN: AD7656YSTZ-1-RL ✓ Hoạt độngAD7656YSTZ-1-RL Tóm tắt
What is a successive-approximation ADC (SAR ADC)? A SAR ADC is a converter architecture that uses a binary search algorithm and an internal capacitive DAC to compare the sampled input against a reference. Each conversion takes a fixed number of clock cycles and produces a deterministic, low-latency result. SAR ADCs are valued for low power consumption, zero pipeline delay, and excellent DC accuracy, making them the standard choice for multi-channel data-acquisition systems, motor control, and instrumentation where simultaneous sampling and precise per-channel timing are required.
Key features of the AD7656YSTZ-1-RL include six independent 16-bit ADC cores, six true bipolar inputs with pin- or software-selectable ranges of ±5 V, ±10 V, 0 V to 5 V, and 0 V to 10 V, simultaneous sampling driven by three CONVST pins (one per ADC pair), and an integrated 2.5 V on-chip reference. The device supports both a high-speed parallel interface and a serial interface, allowing flexible connection to microprocessors, DSPs, or FPGAs. Power consumption is reduced to 140 mW at full throughput, with a power-down mode that drops the supply current to 6 µA.
Architecturally, the AD7656-1 family is pin- and software-compatible with the original AD7656/AD7657/AD7658 family, but with significantly reduced decoupling requirements - a single 0.1 µF capacitor on each AVCC is sufficient. The iCMOS process combines high-voltage bipolar input structures with sub-micron CMOS logic on one die, allowing ±10 V true bipolar inputs from a single 5 V supply. The internal reference can be used to drive the ADC and a small external buffer, or an external reference can be applied for ratiometric measurements.
Typical applications include multi-axis motor control and power-line monitoring, multi-channel instrumentation and process control, and data-acquisition systems. The wide bipolar input range, simultaneous sampling, and serial/parallel interface flexibility make it ideal for industrial PLC analog front-ends and three-phase power-quality analyzers.
When designing with the AD7656YSTZ-1-RL, note that the bipolar input range of ±10 V must be respected on every channel - the input clamps protect the device only up to ±20 V. Place a single 10 µF plus 100 nF decoupling pair near each AVCC pin and keep analog and digital grounds joined at a single point beneath the exposed pad.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho AD7656YSTZ-1-RL — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD7656YSTZ-1-RL (cùng hình factor và footprint) — khác nhau ở Input Type, Package, Resolution, Architecture, RoHS Status.
AD7656YSTZ-1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7656BSTZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7656YSTZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7656A-1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8556IPM
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8558
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7656YSTZ-1-RL Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bits |
| Number of Channels | 6 |
| Tỷ lệ lấy mẫu | 250 kSPS per channel |
| Architecture | Successive Approximation (SAR) |
| Input Type | True bipolar, single-ended |
| Input Voltage Ranges | ±5 V, ±10 V, 0-5 V, 0-10 V (pin/software selectable) |
| Simultaneous Sampling | Yes (3 CONVST pins) |
| Data Interface | Parallel + Serial |
| On-Chip Reference | 2.5 V |
| Power Consumption | 140 mW at 250 kSPS |
| Power-Down Current | 6 µA |
| Supply Voltage (AVCC) | 5 V |
| Supply Voltage (VDRIVE) | 2.7 V to 5.25 V |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C |
| Hộp | 64-LQFP (ST-10, 10x10 mm) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | Compliant |
| Process Technology | iCMOS (industrial CMOS) |
Cấu hình chân AD7656YSTZ-1-RL
| Chân 1 | AVCC — +5 V analog supply |
| Chân 2 | AVCC — +5 V analog supply |
| Chân 3 | AGND — Analog ground |
| Chân 4 | REFCAP — Reference bypass capacitor |
| Chân 5 | REFIN/OUT — Reference input/output (2.5 V nominal) |
| Chân 6 | REFGND — Reference ground |
| Chân 7 | V1 — Analog input channel 1 |
| Chân 8 | V2 — Analog input channel 2 |
| Chân 9 | V3 — Analog input channel 3 |
| Chân 10 | V4 — Analog input channel 4 |
| Chân 11 | V5 — Analog input channel 5 |
| Chân 12 | V6 — Analog input channel 6 |
| Chân 13 | AGND — Analog ground (input stage return) |
| Chân 14 | AVCC — +5 V analog supply (input stage) |
| Chân 15 | RANGE — Input range select (HW or SW) |
| Chân 16 | CONVST_A — Conversion start, ADC pair A (V1, V4) |
| Chân 17 | CONVST_B — Conversion start, ADC pair B (V2, V5) |
| Chân 18 | CONVST_C — Conversion start, ADC pair C (V3, V6) |
| Chân 19 | BUSY — Output: low while conversion in progress |
| Chân 20 | DGND — Digital ground |
| Chân 21 | VDRIVE — Logic supply (2.7 V to 5.25 V) |
| Chân 22 | DOUT_A — Serial data out, pair A |
| Chân 23 | DOUT_B — Serial data out, pair B |
| Chân 24 | DOUT_C — Serial data out, pair C |
| Chân 25 | DB15 — Parallel data bit 15 (MSB) |
| Chân 26 | DB14 — Parallel data bit 14 |
| Chân 27 | DB13 — Parallel data bit 13 |
| Chân 28 | DB12 — Parallel data bit 12 |
| Chân 29 | DB11 — Parallel data bit 11 |
| Chân 30 | DB10 — Parallel data bit 10 |
| Chân 31 | DB9 — Parallel data bit 9 |
| Chân 32 | DB8 — Parallel data bit 8 |
| Chân 33 | DB7 — Parallel data bit 7 |
| Chân 34 | DB6 — Parallel data bit 6 |
| Chân 35 | DB5 — Parallel data bit 5 |
| Chân 36 | DB4 — Parallel data bit 4 |
| Chân 37 | DB3 — Parallel data bit 3 |
| Chân 38 | DB2 — Parallel data bit 2 |
| Chân 39 | DB1 — Parallel data bit 1 |
| Chân 40 | DB0 — Parallel data bit 0 (LSB) |
| Chân 41 | DGND — Digital ground |
| Chân 42 | RD — Parallel read (active low) |
| Chân 43 | CS — Parallel chip select (active low) |
| Chân 44 | WR — Parallel write / input configuration (active low) |
| Chân 45 | OB/2C — Output coding: 0 = straight binary, 1 = twos complement |
| Chân 46 | SER/PAR — Interface mode select (1 = serial) |
| Chân 47 | HWL/SEL — Hardware/software mode for RANGE select |
| Chân 48 | STBY — Standby control |
| Chân 49 | RESET — Reset input (active low) |
| Chân 50 | SCLK — Serial interface clock |
| Chân 51 | SYNC — Serial interface sync |
| Chân 52 | DCEN — Daisy-chain enable (serial mode) |
| Chân 53 | W/B — Word/byte mode for serial interface |
| Chân 54 | AVCC — +5 V analog supply (PLL/digital) |
| Chân 55 | AGND — Analog ground |
| Chân 56 | AVCC — +5 V analog supply |
| Chân 57 | AGND — Analog ground |
| Chân 58 | AVCC — +5 V analog supply |
| Chân 59 | AVCC — +5 V analog supply |
| Chân 60 | AVCC — +5 V analog supply |
| Chân 61 | REGCAP — Internal regulator bypass |
| Chân 62 | DGND — Digital ground |
| Chân 63 | DGND — Digital ground |
| Chân 64 | EP — Exposed pad (recommended to tie to AGND for thermal dissipation) |
Ứng dụng tiêu biểu
AD7656YSTZ-1-RL phù hợp cho 7 Áp dụngs: Three-Phase Power Quality Analyzer, Multi-Axis Motor Control Feedback, PLC Analog Input Module, Data-Acquisition System (DAQ), Medical Patient Monitor Front-End, Automotive Test and Measurement, Audio and Vibration Analyzer.
Three-Phase Power Quality Analyzer
The AD7656YSTZ-1-RL's six true bipolar ±10 V inputs and simultaneous sampling (driven by three independent CONVST signals) map one-to-one onto the three phase voltages and three phase currents of a three-phase AC system. At 250 kSPS per channel a 50/60 Hz fundamental is oversampled by >4000x, enabling accurate harmonic analysis up to the 50th harmonic or higher. The integrated 2.5 V reference eliminates per-channel drift between voltage and current channels, which is critical for accurate real-power (W) and reactive-power (VAR) computation.
Được đề xuất
Multi-Axis Motor Control Feedback
Industrial servo drives require precise, low-latency feedback of three-phase currents per axis; the AD7656YSTZ-1-RL delivers these via its simultaneous-sampling SAR architecture with zero pipeline delay. Current-sense amplifiers scale ±10 V or ±5 V shunt signals into the bipolar ranges the AD7656YSTZ-1-RL accepts natively, and the 140 mW power dissipation keeps junction temperatures low in a compact drive enclosure. At 250 kSPS per channel the device supports field-oriented control (FOC) loops with sub-microsecond effective latency.
Được đề xuất
PLC Analog Input Module
Programmable-logic-controller (PLC) analog input modules typically need 4-8 voltage or current channels per slot, with ±10 V bipolar compliance for legacy industrial sensors. The AD7656YSTZ-1-RL delivers 6 bipolar channels per chip in a compact 64-LQFP footprint, fitting a 4-slot module with 16 channels of analog input. The pin/software-selectable input ranges let one module cover ±5 V, ±10 V, 0-5 V, and 0-10 V without external resistor networks. The serial interface option reduces microcontroller pin count, while the parallel option enables higher burst throughput.
Được đề xuất
Data-Acquisition System (DAQ)
Multi-channel bench-top and rack-mount DAQ systems use the AD7656YSTZ-1-RL as the front-end ADC for vibration, strain-gauge, and general-purpose voltage measurements. Six simultaneous channels capture per-axis acceleration data from MEMS accelerometers or piezoelectric sensors without timing skew between channels. The -1 reduced-decoupling requirement cuts board space and BOM by eliminating the bank of bulk capacitors the original AD7656 needed; one 100 nF per AVCC pin plus a single 10 µF bulk is sufficient.
Được đề xuất
Medical Patient Monitor Front-End
Multi-parameter patient monitors (ECG, EEG, EMG, SpO2) require 6 or more channels of low-noise, mid-bandwidth data acquisition. The AD7656YSTZ-1-RL's 16-bit resolution and bipolar inputs adapt naturally to conditioned bioelectric signals and ±5 V transducer outputs. The 250 kSPS per channel allows oversampling of slow bioelectric waveforms, while the 6 µA power-down mode supports battery-powered portable monitors. Note: medical-safety cert like IEC 60601-1 must be evaluated at the system level.
Được đề xuất
Automotive Test and Measurement
Bench-top automotive test rigs measure battery voltage, current, and temperature on multi-cell battery stacks in parallel. The AD7656YSTZ-1-RL's 6-channel simultaneous sampling captures all 6 thermocouples or cell voltages at the same instant - critical for accurate thermal-runaway detection. The wide bipolar input range accommodates 12 V/24 V/48 V automotive systems directly. The operating temperature range of -40 C to +85 C covers underhood and cabin electronics; derate at extreme ambient as recommended by Analog Devices.
Được đề xuất
Audio and Vibration Analyzer
Multi-channel vibration analyzers and audio test equipment use the AD7656YSTZ-1-RL for simultaneous multi-axis accelerometer capture. Six phase-locked channels capture vibration across the X/Y/Z axes of multiple transducers, eliminating time-skew artifacts in cross-channel frequency analysis. The 250 kSPS per channel supports vibration analysis up to ~100 kHz, covering most structural-health and NVH (noise, vibration, harshness) measurements. Bipolar input ranges adapt to IEPE-type accelerometer outputs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7656YSTZ-1-RL — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | AD7656YSTZ-1 | AD7656BSTZ | AD7656YSTZ | AD7656A-1 | ADS8556IPM | ADS8558 |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Package | 64-LQFP (ST-10x10) | 64-LQFP (ST-10x10) | 64-LQFP (ST-10x10) | 64-LQFP (ST-10x10) | 64-LQFP (ST-10x10) | 64-LQFP (PM-10x10) | 64-LQFP (PM-10x10) |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 12 bits |
| Sampling Rate | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS |
| Channels | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Reduced Decoupling (-1 variant) | Yes | Yes | No | No | Yes (improved PSS) | Yes (TI variant) | Yes (TI variant) |
| On-Chip Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | Ext. only | Ext. only |
| Interface | Parallel + Serial | Parallel + Serial | Parallel + Serial | Parallel + Serial | Parallel + Serial | Parallel + Serial | Parallel + Serial |
| Operating Temp Range | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| RoHS Status | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Bảo phân biệt quan trọng
- True bipolar ±10 V inputs from a single 5 V supply (vsADS8556IPM)
- Integrated 2.5 V reference shared across all six channels (vsADS8558)
- Reduced-decoupling (-1) variant cuts BOM cost (vsAD7656YSTZ (non- -1))
- Six independent converters with three CONVST pins (vsAD7324BRUZ)
Ghi chú thiết kế
The AD7656YSTZ-1-RL draws 140 mW at full 250 kSPS throughput and 6 µA in power-down. Estimated: at 5 V AVCC, peak supply current is approximately 28 mA; design the +5 V regulator to deliver at least 40 mA per chip with 100 mV headroom. Place a 10 µF bulk tantalum or polymer plus 100 nF ceramic pair within 25 mm of each AVCC pin. The reduced-decoupling specification applies only to the -1 die; if replacing with the original AD7656YSTZ non-(-1) variant, add the legacy bulk-capacitor network.
On the 64-LQFP, route analog inputs (V1-V6) on the inner layers or top with ground-shielded traces to avoid digital noise coupling. Keep digital outputs (DB0-DB15, DOUT_*, BUSY) grouped and away from the analog input traces. Reference the exposed pad to a single large ground plane island that ties into the analog ground at one star ground point under the IC. Recommended: dedicate separate analog and digital ground planes joined under the chip's exposed pad.
Do not exceed the bipolar input ±20 V clamp limit on V1-V6 - transients on industrial sensor lines can destroy the input stage. Place 10 kΩ input series resistors and bidirectional TVS clamps (e.g. 16 V) at each input. The on-chip reference requires a 10 µF (min) REFCAP capacitor; with less bypass, the ADC SNR degrades by 5-8 dB. Avoid using CONVST_A, CONVST_B, and CONVST_C simultaneously at asynchronous intervals if simultaneous-channel capture is needed - drive them from the same clock edge for true simultaneous sampling.
When using the parallel bus, place 22 Ω series damping resistors on each DB0-DB15 trace close to the ADC, and clamp each line with 1-10 kΩ pull-down to prevent floating-state transients at 250 kSPS. Estimated: total parallel-bus edge rate is approximately 6 ns with 50 pF total external load; the damping resistor reduces ringing amplitude by 30-50%. For serial mode, the DOUT_A/B/C lines transition at up to 50 MHz - keep these traces short (under 40 mm) and reference them to ground on both sides.
Thông tin tuân thủ
RoHS-compliant per ADI product page and DigiKey listing. AEC-Q100 not applicable - this is an industrial/consumer grade ADC not qualified for automotive production; see ADI automotive-grade variants separately. Conflict-mineral status per ADI corporate policy - check with ADI legal for specific declaration.
