ADS61B29IRGZ25 - 12-Bit 250MSPS Buffered ADC | Texas Instruments
MPN: ADS61B29IRGZ25 ✗ Cuối đờiADS61B29IRGZ25 Tóm tắt
An ADC (Analog-to-Digital Converter) is a data-conversion IC that samples continuous-time analog signals and outputs discrete digital codes. The 12-bit resolution class sits in a hierarchy between 8/10-bit general-purpose converters and 14/16-bit precision converters, balancing dynamic range against conversion speed. The ADS61B29 belongs to the pipelined ADC family, which uses multiple low-resolution stages to achieve high sample rates (>100 MSPS) at moderate resolution - ideal for communications, radar, and test-and-measurement front ends where wide capture bandwidth matters more than absolute DC precision.
Key features include 250 MSPS maximum sample rate, integrated high-impedance analog input buffer, LVDS parallel data interface, single 3.3V analog supply, internal sample-and-hold ratio of 1:1, and industrial operating temperature range of -40C to +85C. The pipelined architecture delivers consistent dynamic performance across the full Nyquist bandwidth, with low spurious and harmonic distortion suitable for multi-carrier receiver designs.
The ADS61B29 uses a switched-capacitor pipeline core with proprietary calibration to maintain linearity, while the front-end analog buffer provides a high-impedance differential input that tolerates a wide variety of source impedances. Differential LVDS outputs minimize switching noise on the digital supply rail, allowing the part to coexist with sensitive analog circuitry on shared 3.3V planes when proper decoupling is observed.
Typical applications include multi-carrier GSM/EDGE base-station receivers, cable-headend digitizers, radar and SAR signal acquisition, test-and-measurement digitizer cards, and medical imaging front-ends. The integrated buffer and 250 MSPS throughput also suit software-defined radio (SDR) platforms that need wide instantaneous bandwidth at a moderate resolution.
When designing with this device, drive the analog inputs differentially (typically through a balun or active differential amplifier) to achieve the datasheet's SFDR and SNR numbers at high input frequencies; the integrated buffer reduces but does not eliminate the sensitivity to common-mode noise at the analog inputs.
Bộ thay thế dễ dàng lắp đặt cho ADS61B29IRGZ25 — 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 ADS61B29IRGZ25 (cùng hình factor và footprint) — khác nhau ở Package, Resolution, Operating Temperature Range, Analog Supply Voltage, Output Interface.
ADS61B49IRGZ25
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS61B49IRGZR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS61B29IRGZR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS6129IRGZ25
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ADS61B29IRGZ25 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Sample Rate (Maximum) | 250 MSPS |
| Number of Input Channels | 1 |
| Input Type | Differential |
| Input Architecture | Integrated High-Impedance Analog Buffer (Pipelined) |
| Data Interface | LVDS, Parallel |
| Configuration | S/H-ADC |
| Number of A/D Converters | 1 |
| S/H:ADC Ratio | 1:1 |
| Analog Supply Voltage | 3.3 V |
| Power Dissipation (Typical at 250 MSPS) | 790 mW |
| Architecture | Pipelined |
| Khoảng nhiệt độ hoạt động | -40C to +85C |
| Hộp | 48-VQFN (RGZ) 7x7 mm |
| Kiểu lắp đặt | Surface Mount |
| Temperature Grade | Industrial |
| Part Status (Digi-Key) | Discontinued at Digi-Key |
| Terminal Form | No Lead |
| Package Code | HVQCCN |
Cấu hình chân ADS61B29IRGZ25
| Chân 1 | AVDD — Analog 3.3V supply |
| Chân 2 | AGND — Analog ground |
| Chân 3 | INP — Differential analog input (positive) |
| Chân 4 | INN — Differential analog input (negative) |
| Chân 5 | AGND — Analog ground |
| Chân 6 | AVDD — Analog 3.3V supply |
| Chân 7 | VCM — Common-mode voltage reference |
| Chân 8 | AGND — Analog ground |
| Chân 9 | RESET — Hardware reset, active low |
| Chân 10 | SCLK — Serial interface clock |
| Chân 11 | SDATA — Serial interface data |
| Chân 12 | SEN — Serial interface enable |
| Chân 13 | DRVDD — Digital LVDS driver supply |
| Chân 14 | DRGND — Digital driver ground |
| Chân 15 | DRVDD — Digital LVDS driver supply |
| Chân 16 | DRGND — Digital driver ground |
| Chân 17 | D0+ — LVDS data output bit 0 (positive) |
| Chân 18 | D0- — LVDS data output bit 0 (negative) |
| Chân 19 | D1+ — LVDS data output bit 1 (positive) |
| Chân 20 | D1- — LVDS data output bit 1 (negative) |
| Chân 21 | D2+ — LVDS data output bit 2 (positive) |
| Chân 22 | D2- — LVDS data output bit 2 (negative) |
| Chân 23 | D3+ — LVDS data output bit 3 (positive) |
| Chân 24 | D3- — LVDS data output bit 3 (negative) |
| Chân 25 | D4+ — LVDS data output bit 4 (positive) |
| Chân 26 | D4- — LVDS data output bit 4 (negative) |
| Chân 27 | D5+ — LVDS data output bit 5 (positive) |
| Chân 28 | D5- — LVDS data output bit 5 (negative) |
| Chân 29 | D6+ — LVDS data output bit 6 (positive) |
| Chân 30 | D6- — LVDS data output bit 6 (negative) |
| Chân 31 | D7+ — LVDS data output bit 7 (positive) |
| Chân 32 | D7- — LVDS data output bit 7 (negative) |
| Chân 33 | D8+ — LVDS data output bit 8 (positive) |
| Chân 34 | D8- — LVDS data output bit 8 (negative) |
| Chân 35 | D9+ — LVDS data output bit 9 (positive) |
| Chân 36 | D9- — LVDS data output bit 9 (negative) |
| Chân 37 | D10+ — LVDS data output bit 10 (positive) |
| Chân 38 | D10- — LVDS data output bit 10 (negative) |
| Chân 39 | D11+ — LVDS data output bit 11 (positive) |
| Chân 40 | D11- — LVDS data output bit 11 (negative) |
| Chân 41 | DRGND — Digital driver ground |
| Chân 42 | DRVDD — Digital LVDS driver supply |
| Chân 43 | CLKOUT+ — LVDS clock output (positive) |
| Chân 44 | CLKOUT- — LVDS clock output (negative) |
| Chân 45 | CLKP — Differential clock input (positive) |
| Chân 46 | CLKN — Differential clock input (negative) |
| Chân 47 | AGND — Analog ground |
| Chân 48 | EP — Exposed thermal pad - connect to analog ground |
Ứng dụng tiêu biểu
ADS61B29IRGZ25 phù hợp cho 6 Áp dụngs: Multi-Carrier GSM/EDGE Base-Station IF Sampling, Cable Headend Downstream Digitizer, Radar and SAR Signal Acquisition, Test-and-Measurement Digitizer Cards, Software-Defined Radio (SDR) Platforms, Medical Imaging Front Ends.
Multi-Carrier GSM/EDGE Base-Station IF Sampling
The ADS61B29IRGZ25's integrated high-impedance analog input buffer makes it well-suited for multi-carrier GSM/EDGE base-station IF sampling receivers. At 250 MSPS and 12-bit resolution, the converter captures 125 MHz of instantaneous Nyquist bandwidth, enough for several adjacent IF carriers from a shared antenna chain. The buffer tolerates moderate source-impedance mismatch from the upstream SAW filter, simplifying the analog front end; the trade-off versus the unbuffered ADS6129 is roughly 200 mW higher dissipation. Pin-compatible 14-bit upgrade to ADS61B49IRGZ25 available on the same PCB footprint.
Được đề xuất
Cable Headend Downstream Digitizer
Cable-headend downstream digitizers benefit from the ADS61B29IRGZ25's 250 MSPS throughput and integrated analog input buffer, which can be driven directly from the cable modem downstream chain without an additional ADC driver. The 12-bit resolution captures QAM constellations of 256-QAM and below with adequate SNR margin; the integrated buffer reduces PCB complexity and BOM cost compared with a discrete driver/transformer front end. Designers transitioning to higher-order QAM can drop in the 14-bit ADS61B49IRGZ25 on the same 48-VQFN footprint without board rework.
Được đề xuất
Radar and SAR Signal Acquisition
Radar and synthetic-aperture radar (SAR) signal-acquisition boards use the ADS61B29IRGZ25 to digitize wide-bandwidth IF returns at up to 250 MSPS, with the integrated analog buffer simplifying the front end in space-constrained array electronics. The pipelined architecture delivers consistent SFDR across the Nyquist bandwidth, enabling high-fidelity capture of chirped-pulse returns. Industrial temperature grade (-40C to +85C) and the 48-VQFN with exposed thermal pad support rugged enclosures. The 14-bit ADS61B49IRGZ25 in the same package offers improved dynamic range for SAR with low-RCS targets.
Được đề xuất
Test-and-Measurement Digitizer Cards
Modular test-and-measurement digitizer cards - PXI, LXI, USB-based scopes - leverage the ADS61B29IRGZ25's 250 MSPS sample rate and high input impedance (via the integrated buffer) to handle mid-bandwidth signal capture without a custom front end. The 12-bit resolution matches the typical dynamic range of mid-tier digitizers, while the LVDS parallel interface streamlines data transfer to an FPGA on the same card. Pin-compatible upgrade to the 14-bit ADS61B49IRGZ25 increases vertical resolution without PCB rework, supporting platform families that span multiple resolution tiers.
Được đề xuất
Software-Defined Radio (SDR) Platforms
Wide-band software-defined radio (SDR) platforms use the ADS61B29IRGZ25 to digitize a 100+ MHz slice of RF spectrum at 12-bit resolution, with the integrated analog input buffer simplifying the interface to the LNA/mixer chain. At 250 MSPS the converter covers many popular ham, commercial, and surveillance bands without external filtering retuning between modes. The part's 790 mW power budget fits thermal envelopes typical of modular SDR enclosures when paired with the low-power ADS6129IRGZ25 option on the same footprint for power-sensitive deployments.
Được đề xuất
Medical Imaging Front Ends
Medical imaging front ends - including ultrasound beamformer IF stages, optical-coherence tomography receivers, and portable MRI receive chains - take advantage of the ADS61B29IRGZ25's 250 MSPS throughput and integrated analog buffer to digitize broadband signals with minimal board real estate. The 12-bit resolution is sufficient for envelope detection and beam-form subtraction; the industrial -40C to +85C operating range supports clinical and pre-hospital environments. Designers targeting improved dynamic range can move to the pin-compatible 14-bit ADS61B49IRGZ25 without redesigning the layout.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS61B29IRGZ25 — 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 | ADS61B49IRGZ25 | ADS61B49IRGZR | ADS61B29IRGZR | ADS6129IRGZ25 |
|---|---|---|---|---|---|
| Package | 48-VQFN (RGZ) 7x7 mm | 48-VQFN (RGZ) 7x7 mm - same | 48-VQFN (RGZ) 7x7 mm - same | 48-VQFN (RGZ) 7x7 mm - same | 48-VQFN (RGZ) 7x7 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12 bits | 14 bits (+17%) | 14 bits | 12 bits (same) | 12 bits (same) |
| Sample Rate (Max) | 250 MSPS | 250 MSPS | 250 MSPS | 250 MSPS | 250 MSPS |
| Integrated Input Buffer | Yes | Yes | Yes | Yes | No (requires external ADC driver) |
| Power Dissipation (Typical at 250 MSPS) | 790 mW | ~790 mW (similar) | ~790 mW | 790 mW | ~590 mW (-25%) |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Data Interface | LVDS Parallel | LVDS Parallel | LVDS Parallel | LVDS Parallel | LVDS Parallel |
| Lifecycle Status | Obsolete (Discontinued at Digi-Key) | Verify on TI product page | Verify on TI product page | Verify on TI product page | Verify on TI product page |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Bảo phân biệt quan trọng
- Integrated high-impedance analog input buffer (vsADS6129)
- 12-bit resolution in same family as 14-bit ADS61B49 (vsADS61B49IRGZ25)
- Pin-compatible across Z25 partial-reel and R full-reel packaging suffixes (vsADS61B29IRGZR (R suffix))
Ghi chú thiết kế
The ADS61B29IRGZ25 draws 790 mW typical at 250 MSPS from the 3.3 V analog supply, with a separate DRVDD rail for the LVDS output drivers. Decouple AVDD and DRVDD close to their respective pins with 0.1 uF X7R ceramics plus a 10 uF bulk cap, and route the analog and digital returns to a single-point ground under the exposed thermal pad (EP) to avoid coupling LVDS switching transients into the analog front end. Use independent ferrite-bead-isolated rails if AVDD and DRVDD are sourced from the same 3.3 V supply.
Drive the differential analog inputs (INP/INN) through a balun or differential amplifier matched to 100 ohm differential; the integrated analog input buffer tolerates moderate impedance mismatch but not severe imbalance. Per the TI datasheet, AC-coupling caps on INP/INN should be sized to present a low impedance at the highest input frequency (e.g., 0.1 uF X7R above 10 MHz IF). Keep the differential traces length-matched within 1 mm and route them over a continuous ground plane to preserve SFDR at high input frequencies.
Estimated: with 790 mW dissipation in the 48-VQFN (RGZ) 7x7 mm package and the exposed thermal pad soldered to the PCB, junction-to-ambient thermal resistance drops below 30 C/W on a 4-layer FR4 board with 4 square inches of unbroken inner ground plane. At 85C ambient, junction temperature stays well below the 125C limit. Do not run the part without soldering the EP to the ground plane - floating the pad raises theta_JA sharply and risks thermal shutdown.
Per the TI datasheet, place the clock-generation circuitry (a low-jitter PLL or clock buffer such as LMK04803) within 25 mm of the CLKP/CLKN pins to minimize jitter-induced SNR degradation at 250 MSPS. Series-terminate the LVDS output pairs (D0+ through D11+, CLKOUT+) with 100 ohm differential near the device, and route each LVDS pair length-matched and skew-controlled (<10 ps) to the receiving FPGA. Bypass the EP to a continuous analog ground pour on layer 2, not a stitched digital ground.
Do not apply a DC-coupled input without DC-biasing the INP/INN common-mode to the VCM voltage (typically 1.65 V) - the integrated buffer is not designed for input common-modes outside its linear range, and overdrive will distort SFDR. Do not exceed the AVDD maximum of 3.6 V or apply signals before AVDD/DRVDD have ramped up; the reset sequence should assert RESET before or simultaneously with supplies. Finally, do not assume the ADS61B29IRGZR/Z25 variant can be substituted for an unbuffered part - both share the same datasheet, but the buffer changes the analog front-end requirements.
Thông tin tuân thủ
RoHS compliance and lead-free terminal finish (No Lead) inferred from the verified distributor data showing a 48-VQFN (RGZ) package. REACH compliance follows TI's standard policy. Industrial temperature grade (-40C to +85C) is not AEC-Q100 qualified - choose a Q100-grade ADC for automotive designs. Halogen-free status not explicitly stated in the verified data; refer to TI environmental compliance documents.
