ADS61B49IRGZ25 - 14-Bit 250MSPS Buffered ADC | Texas Instruments
MPN: ADS61B49IRGZ25 ✓ نشطADS61B49IRGZ25 نظرة عامة
An ADC (Analog-to-Digital Converter) is a mixed-signal integrated circuit that converts continuous analog waveforms into discrete digital codes at a defined sample rate. Pipelined ADCs use a multi-stage architecture to achieve high sample rates (hundreds of MSPS) with moderate resolution (10-16 bits), occupying a position in the signal chain hierarchy: sensor/buffer -> variable-gain amplifier -> ADC -> DSP/FPGA. The ADS61B49 belongs to TI's ADS61xx family of buffered-input, low-power data converters used in communications, test equipment, and industrial imaging.
Key specifications include 14-bit resolution, 250 MSPS maximum sample rate, internal references eliminating the need for external reference decoupling capacitors, parallel/LVDS output interface, and an integrated input buffer that handles high source-impedance sensors directly. The 48-VQFN package provides an exposed thermal pad for low thermal resistance, supporting reliable operation across the full industrial temperature range.
Architecturally, the device uses a multi-stage pipelined core with on-chip sample-and-hold and internal bandgap references. The input buffer isolates the switched-capacitor sampling front-end from external drive circuitry, improving SFDR/SNR performance when the source impedance is non-zero. The internal references remove layout sensitivity around external reference pins, a common pitfall in high-speed ADC designs.
Typical applications include communications test equipment, multi-carrier GSM/UMTS/LTE base-station receivers, medical imaging front-ends, industrial ultrasound, and high-speed data acquisition systems. The buffered input makes it particularly suitable for direct connection to differential IF stages without an external op-amp driver.
When designing with this device, allocate sufficient PCB area for the thermal pad and stitch vias to inner ground planes; route LVDS outputs with controlled 100-ohm differential impedance; and place input coupling capacitors and common-mode bias resistors as close to the analog input pins as the layout allows. Use a quiet, low-noise LDO such as the TPS7A4701 on the AVDD rail to maximize SFDR.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. It is intended to accelerate sourcing and first-pass PCB decisions for engineers specifying a 250 MSPS buffered-input ADC.
بدائل مباشرة لـ ADS61B49IRGZ25 — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع ADS61B49IRGZ25 (نفس عامل الشكل والبصمة) — يختلف في Operating Temperature Range, Package, Resolution, Analog Supply Voltage, Input Type.
ADS61B49IRGZT
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ADS61B49IRGZR
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ADS61B29IRGZ25
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ADS6129IRGZ25
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ADS62P23IRGC25
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ADS61B49IRGZ25 الحدود القصوى والخصائص الكهربائية
| الدقة | 14 bit |
| Sample Rate (Max) | 250 MSPS |
| Number of Channels | 1 |
| Architecture | Pipelined |
| Analog Input Type | Buffered, differential |
| Data Interface | Parallel / LVDS |
| Reference Type | Internal (no external ref pins) |
| Analog Supply Voltage | 1.8 V (typ) |
| Digital Supply Voltage | 1.8 V to 3.3 V |
| نطاق درجة حرارة التشغيل | -40 C to +85 C |
| العلبة | 48-pin VQFN (RGZ) 7x7 mm with EP |
| نوع التركيب | Surface Mount |
| مستوى MSL | 3 (168 hours) |
| حالة RoHS | Compliant |
تكوين أطراف ADS61B49IRGZ25
| دبوس 1 | INP — Positive analog input (differential) |
| دبوس 2 | INM — Negative analog input (differential) |
| دبوس 3 | VCM — Common-mode voltage output (bias for input coupling) |
| دبوس 4 | AVDD — Analog supply, 1.8 V |
| دبوس 5 | AGND — Analog ground |
| دبوس 6 | CLK — Sampling clock input (differential) |
| دبوس 7 | CLKM — Sampling clock input complement |
| دبوس 8 | DRVDD — Digital output driver supply, 1.8 V to 3.3 V |
| دبوس 9 | DRGND — Digital output driver ground |
| دبوس 10 | D[0] — LVDS/parallel data output bit 0 |
| دبوس 11 | D[1] — LVDS/parallel data output bit 1 |
| دبوس 12 | D[2] — LVDS/parallel data output bit 2 |
| دبوس 13 | D[3] — LVDS/parallel data output bit 3 |
| دبوس 14 | D[4] — LVDS/parallel data output bit 4 |
| دبوس 15 | D[5] — LVDS/parallel data output bit 5 |
| دبوس 16 | D[6] — LVDS/parallel data output bit 6 |
| دبوس 17 | D[7] — LVDS/parallel data output bit 7 |
| دبوس 18 | D[8] — LVDS/parallel data output bit 8 |
| دبوس 19 | D[9] — LVDS/parallel data output bit 9 |
| دبوس 20 | D[10] — LVDS/parallel data output bit 10 |
| دبوس 21 | D[11] — LVDS/parallel data output bit 11 |
| دبوس 22 | D[12] — LVDS/parallel data output bit 12 |
| دبوس 23 | D[13] — LVDS/parallel data output bit 13 |
| دبوس 24 | DCLK — LVDS/parallel data clock output |
| دبوس 25 | FCLK — LVDS frame clock output |
| دبوس 26 | AGND — Analog ground |
| دبوس 27 | AVDD — Analog supply, 1.8 V |
| دبوس 28 | NC — Not connected (per datasheet) |
| دبوس 29 | SEN — Serial interface enable |
| دبوس 30 | SDATA — Serial interface data |
| دبوس 31 | SCLK — Serial interface clock |
| دبوس 32 | RESET — Hardware reset, active low |
| دبوس 33 | PDN — Power-down, active high |
| دبوس 34 | AVDD — Analog supply, 1.8 V |
| دبوس 35 | AGND — Analog ground |
| دبوس 36 | AVDD — Analog supply, 1.8 V |
| دبوس 37 | AGND — Analog ground |
| دبوس 38 | NC — Not connected (per datasheet) |
| دبوس 39 | NC — Not connected (per datasheet) |
| دبوس 40 | AVDD — Analog supply, 1.8 V |
| دبوس 41 | AGND — Analog ground |
| دبوس 42 | AVDD — Analog supply, 1.8 V |
| دبوس 43 | AGND — Analog ground |
| دبوس 44 | NC — Not connected (per datasheet) |
| دبوس 45 | NC — Not connected (per datasheet) |
| دبوس 46 | AVDD — Analog supply, 1.8 V |
| دبوس 47 | AGND — Analog ground |
| دبوس 48 | EP — Exposed thermal pad - must be soldered to AGND pour with thermal vias |
التطبيقات النموذجية
ADS61B49IRGZ25 مناسب لـ 6 التطبيقs: Communications Test Equipment, Multi-Carrier Wireless Base-Station Receiver, Medical Ultrasound Imaging Front-End, Industrial High-Speed DAQ Module, Software-Defined Radio (SDR) Front-End, Radar and Lidar Signal Acquisition.
Communications Test Equipment
The ADS61B49IRGZ25's 14-bit resolution at 250 MSPS makes it well-suited for digitizing wideband IF signals in bench-top spectrum analyzers, signal generators, and modular instrumentation. The integrated analog input buffer allows direct connection to the IF output of a mixer without an external op-amp driver, reducing the front-end bill of materials and improving SFDR at high source impedances. Engineers route the LVDS data into an FPGA for FFT-based demodulation, achieving sufficient spurious-free dynamic range to characterize adjacent-channel leakage in production-line LTE and 5G NR transmitter tests.
موصى به
Multi-Carrier Wireless Base-Station Receiver
In multi-carrier GSM, UMTS, and LTE base-station receiver chains, the ADS61B49IRGZ25 digitizes intermediate-frequency signals carrying multiple adjacent carriers simultaneously. The 250 MSPS sample rate provides oversampling headroom for digital filtering and decimation, while the 14-bit resolution delivers adequate dynamic range for crest-factor management of aggregated carrier waveforms. The internal references and buffered input reduce PCB area, enabling compact remote-radio-head (RRH) designs where board real estate and thermal density are critical.
موصى به
Medical Ultrasound Imaging Front-End
Diagnostic ultrasound systems digitize phased-array transducer channels at high sample rates to support beamforming and Doppler processing. The ADS61B49IRGZ25's integrated analog input buffer handles the high-impedance piezoelectric transducer signals directly, eliminating per-channel external drivers that would otherwise dominate PCB area and BOM cost across the 64- to 128-channel arrays. At 250 MSPS with 14 bits, the ADC delivers sufficient time-domain resolution for harmonic imaging modes used in cardiac and vascular diagnostics.
موصى به
Industrial High-Speed DAQ Module
Modular data-acquisition systems for vibration analysis, machine-condition monitoring, and radar digitizing benefit from the ADS61B49IRGZ25's combination of 250 MSPS sample rate, 14-bit resolution, and integrated buffer. The buffered input tolerates long cable runs to piezoelectric accelerometers and IEPE sensors without external driver stages. The internal references eliminate trimming procedures, simplifying factory calibration in high-volume industrial DAQ module production lines used for predictive-maintenance installations.
موصى به
Software-Defined Radio (SDR) Front-End
Wideband software-defined radio platforms for spectrum monitoring, electronic warfare training, and amateur-radio transceivers require ADCs that can capture large instantaneous bandwidths. The ADS61B49IRGZ25's 250 MSPS sample rate supports roughly 100 MHz of usable Nyquist-bandwidth capture per channel, while its 14-bit resolution preserves dynamic range against in-band interferers. The buffered input connects directly to common SDR front-end mixer outputs, simplifying the analog chain between antenna, LNA, mixer, and ADC.
موصى به
Radar and Lidar Signal Acquisition
Automotive and industrial radar systems, plus automotive lidar receivers, digitize IF or baseband chirp returns at high sample rates for range-Doppler processing. The ADS61B49IRGZ25 supports a single-channel 250 MSPS acquisition path for short-range (<60 GHz) radar front-ends. Its industrial -40 C to +85 C temperature range and 48-VQFN package suit the harsh thermal environment of automotive ADAS sensor modules, where compact PCB layout and AEC-Q-qualified parts are required by tier-1 OEM specifications.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ ADS61B49IRGZ25 — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | ADS61B49IRGZT | ADS61B49IRGZR | ADS61B29IRGZ25 | ADS6129IRGZ25 | ADS62P23IRGC25 |
|---|---|---|---|---|---|---|
| Package | 48-VQFN (RGZ) 7x7 mm | 48-VQFN (RGZ) - same | 48-VQFN (RGZ) - same | 48-VQFN (RGZ) - same | 48-VQFN (RGZ) - same | 48-VQFN (RGZ) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 14 bit | 14 bit | 14 bit | 12 bit | 12 bit | 12 bit |
| Max Sample Rate | 250 MSPS | 250 MSPS | 250 MSPS | 250 MSPS | 125/210 MSPS (family) | 80/105 MSPS per channel (dual) |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 2 |
| Input Buffer | Integrated | Integrated | Integrated | Integrated | Integrated | Integrated |
| Reference Type | Internal | Internal | Internal | Internal | Internal | Internal |
| Output Interface | Parallel / LVDS | Parallel / LVDS | Parallel / LVDS | Parallel / LVDS | Parallel / LVDS | Parallel / LVDS |
| Automotive Grade (AEC-Q100) | No (Industrial) | No (Industrial) | No (Industrial) | No (Industrial) | No (Industrial) | No (Industrial) |
| Approx. Unit Price (USD, qty 1) | 38.50 | 38.50 | 38.50 | lower | lower | lower |
أبرز الفروقات
- Integrated analog input buffer eliminates external driver op-amp (مقابلADS62P48IRGC25 (dual-channel, 14-bit, 250 MSPS))
- 14-bit resolution at 250 MSPS in a single-channel pin-compatible family (مقابلADS61B29IRGZ25 (12-bit sibling))
- Internal references - no external reference pins (مقابلADS5484IRGC25 (16-bit, 170 MSPS, external ref pins))
- Same 48-VQFN package across the 14-bit, 12-bit, and lower-speed siblings (مقابلADS6129IRGZ25 (lower-speed family member))
ملاحظات التصميم
The 48-VQFN (RGZ) exposed thermal pad must be soldered to a continuous analog-ground copper pour with a 4x4 (minimum) grid of 0.3 mm thermal vias stitching to inner ground planes. Per the TI datasheet layout section, this provides both the ground reference for the input buffer and the primary thermal path; deleting the EP soldering compromises both electrical and thermal performance. Place input-coupling capacitors and the VCM common-mode bypass within 2 mm of the INP/INM pins.
Power the AVDD rail with a low-noise LDO such as the TPS7A4701RGWR; a switching converter introduces wideband noise that couples into the input buffer and degrades SFDR by 5-10 dB. Place a 10 uF X7R ceramic plus a 0.1 uF NP0/C0G bypass within 1 mm of each AVDD pin. The DRVDD rail can tolerate a switching converter if pi-filtered, since output-domain supply noise couples only through the LVDS driver stage.
Route the LVDS data outputs (D[0:13], DCLK, FCLK) with 100-ohm differential impedance and keep traces length-matched within 1 mm (5 ps) to avoid inter-pair skew. The ADC's internal serializer determines the LVDS eye; route adjacent LVDS pairs on the same layer with a continuous reference-ground plane underneath. Match the differential CLK/CLKM input pair within 1 mm to preserve the sampling instant and minimize aperture jitter.
Do not assume the input buffer eliminates source-impedance matching; for best SFDR, drive INP/INM through a wideband transformer (e.g., ADT1-1WT) or a balun with a defined source impedance. Avoid routing digital LVDS signals across the analog INP/INM traces on any layer, including inner layers split under the ADC - they will couple spurs into the input. If using the serial interface (SDATA/SCLK/SEN), tie SDATA low during reset to prevent latch-up of the configuration register.
معلومات الامتثال
RoHS and REACH compliant per TI product page; lead-free (Pb-free) terminal finish; not AEC-Q100 qualified - industrial temperature grade only (-40C to +85C).
