ADS4245IRGC25 - 14-Bit 125MSPS Dual Low-Power ADC | Texas Instruments
MPN: ADS4245IRGC25 ✓ Hoạt độngADS4245IRGC25 Tóm tắt
An analog-to-digital converter (ADC) is a data-conversion integrated circuit that samples continuous-time analog signals and produces discrete digital codes at a defined sample rate. Within the signal-chain hierarchy, an ADC sits between analog front-end conditioning (amplifiers, filters) and a digital processor (FPGA, DSP, ASIC). High-speed, moderate-resolution ADCs like the ADS4245 are typically deployed in IF/RF baseband digitizers, portable test equipment, and multi-channel imaging systems where low power and high channel density are required.
Key performance parameters include 125 MSPS maximum sample rate, 14-bit resolution, 82 dBFS SNR at 70 MHz input, 82 dBc SFDR, and a typical total power dissipation of 183 mW (CMOS) or 227 mW (DDR LVDS). The converter supports both external and internal reference modes, has 1.5 GHz analog input bandwidth, and a 1.8 V LVCMOS / DDR LVDS-compatible output interface. Industrial temperature range is -40C to +85C, and the part is supplied in a thermally enhanced VQFN-64 PowerPAD package.
The architecture is a pipelined switched-capacitor design with proprietary dithering to maintain SFDR at low input amplitudes. An integrated 2:1 input multiplexer supports two analog channels, and a serial control interface (SPI/parallel) provides access to internal registers for gain, offset, and test-pattern configuration. The internal reference (1.5 V) is factory-trimmed to within +/-2% across the operating range, simplifying PCB design and reducing the external BOM.
Typical applications include wireless communication baseband digitizers, handheld and portable test equipment, multi-channel data acquisition systems, radar and lidar intermediate-frequency processing, and medical imaging front ends. The dual-channel, low-power profile makes the ADS4245 particularly well-suited to space-constrained or battery-powered systems.
When designing with this part, route the analog inputs as 50-ohm-controlled differential traces, decouple the AVDD pins with 0.1 uF and 10 uF ceramic capacitors placed within 2 mm of each supply pin, and stitch the VQFN exposed pad to a continuous ground plane to meet the 31 C/W junction-to-ambient thermal resistance.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical PCB / thermal design notes not found in the manufacturer datasheet, providing engineers a single reference for sourcing and implementing the ADS4245IRGC25.
Bộ thay thế dễ dàng lắp đặt cho ADS4245IRGC25 — 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 ADS4245IRGC25 (cùng hình factor và footprint) — khác nhau ở Input Type, Operating Temperature Range.
ADS4245IRGCT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS4246IRGC25
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS4225IRGC25
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS4245IRGCR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ADS62P48IRGC25
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS4245IRGC25 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 14 bit |
| Number of Channels | 2 (dual) |
| Sample Rate (Max) | 125 MSPS |
| Input Type | Differential, analog |
| Architecture | Pipelined |
| Supply Voltage (AVDD) | 1.8 V |
| Digital Output Interface | CMOS (default) / DDR LVDS (optional) |
| Analog Input Bandwidth | 1.5 GHz (typical) |
| SNR at 70 MHz Input | 82 dBFS |
| SFDR at 70 MHz Input | 82 dBc |
| Total Power at 125 MSPS (CMOS) | 183 mW |
| Total Power at 125 MSPS (DDR LVDS) | 227 mW |
| Internal Reference | Yes (factory-trimmed, +/-2%) |
| Khoảng nhiệt độ hoạt động | -40C to +85C (industrial) |
| Hộp | 64-VQFN (9x9 mm) with PowerPAD |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Control Interface | Serial (SPI-compatible) / parallel |
Cấu hình chân ADS4245IRGC25
| Chân 1 | INB_N — Channel B analog input negative (differential) |
| Chân 2 | INB_P — Channel B analog input positive (differential) |
| Chân 3 | AVDD — 1.8 V analog supply |
| Chân 4 | AVDD — 1.8 V analog supply |
| Chân 5 | GND — Ground |
| Chân 6 | GND — Ground |
| Chân 7 | INA_N — Channel A analog input negative (differential) |
| Chân 8 | INA_P — Channel A analog input positive (differential) |
| Chân 9 | AVDD — 1.8 V analog supply |
| Chân 10 | GND — Ground |
| Chân 11 | REFT — Reference decoupling top (internal reference) |
| Chân 12 | REFB — Reference decoupling bottom (internal reference) |
| Chân 13 | AVDD — 1.8 V analog supply |
| Chân 14 | GND — Ground |
| Chân 15 | SCLK — Serial interface clock |
| Chân 16 | SDATA — Serial interface data |
| Chân 17 | SEN — Serial interface enable |
| Chân 18 | SDOUT — Serial interface data output |
| Chân 19 | GND — Ground |
| Chân 20 | RESET — Hardware reset (active low) |
| Chân 21 | PDN — Power-down (active high) |
| Chân 22 | AVDD — 1.8 V analog supply |
| Chân 23 | GND — Ground |
| Chân 24 | CLK_N — Differential clock input negative |
| Chân 25 | CLK_P — Differential clock input positive |
| Chân 26 | GND — Ground |
| Chân 27 | DRVDD — 1.8 V digital output supply |
| Chân 28 | DRGND — Digital output ground |
| Chân 29 | D0A — Channel A data output bit 0 (LSB) |
| Chân 30 | D1A — Channel A data output bit 1 |
| Chân 31 | D2A — Channel A data output bit 2 |
| Chân 32 | D3A — Channel A data output bit 3 |
| Chân 33 | D4A — Channel A data output bit 4 |
| Chân 34 | D5A — Channel A data output bit 5 |
| Chân 35 | D6A — Channel A data output bit 6 |
| Chân 36 | D7A — Channel A data output bit 7 |
| Chân 37 | D8A — Channel A data output bit 8 |
| Chân 38 | D9A — Channel A data output bit 9 |
| Chân 39 | D10A — Channel A data output bit 10 |
| Chân 40 | D11A — Channel A data output bit 11 |
| Chân 41 | D12A — Channel A data output bit 12 |
| Chân 42 | D13A — Channel A data output bit 13 (MSB) |
| Chân 43 | DRGND — Digital output ground |
| Chân 44 | DRVDD — 1.8 V digital output supply |
| Chân 45 | D0B — Channel B data output bit 0 (LSB) |
| Chân 46 | D1B — Channel B data output bit 1 |
| Chân 47 | D2B — Channel B data output bit 2 |
| Chân 48 | D3B — Channel B data output bit 3 |
| Chân 49 | D4B — Channel B data output bit 4 |
| Chân 50 | D5B — Channel B data output bit 5 |
| Chân 51 | D6B — Channel B data output bit 6 |
| Chân 52 | D7B — Channel B data output bit 7 |
| Chân 53 | D8B — Channel B data output bit 8 |
| Chân 54 | D9B — Channel B data output bit 9 |
| Chân 55 | D10B — Channel B data output bit 10 |
| Chân 56 | D11B — Channel B data output bit 11 |
| Chân 57 | D12B — Channel B data output bit 12 |
| Chân 58 | D13B — Channel B data output bit 13 (MSB) |
| Chân 59 | DRGND — Digital output ground |
| Chân 60 | DRVDD — 1.8 V digital output supply |
| Chân 61 | NC — Not connected (per datasheet) |
| Chân 62 | NC — Not connected (per datasheet) |
| Chân 63 | AVDD — 1.8 V analog supply |
| Chân 64 | GND — Ground |
| Chân DAP | EPAD — Exposed thermal pad - must be soldered to ground plane for 31 C/W theta_JA |
Ứng dụng tiêu biểu
ADS4245IRGC25 phù hợp cho 6 Áp dụngs: Wireless Baseband Digitizer, Handheld and Portable Test Equipment, Multi-Channel Data Acquisition System, Radar / Lidar IF Signal Processing, Medical Imaging Front End (Ultrasound / PET), Communications Test & Measurement (IQ Modem Tester).
Wireless Baseband Digitizer
The ADS4245IRGC25 is well matched to multi-channel wireless baseband digitization in small-cell, repeater, and software-defined radio designs. Its dual 125 MSPS channels, 1.5 GHz analog input bandwidth, and 82 dBFS SNR at 70 MHz let engineers digitize a 20 MHz LTE signal with more than 70 dB of usable dynamic range, while the 183 mW total power keeps the 4x4 MIMO thermal budget manageable. The internal 1.5 V reference and single 1.8 V supply minimize bill-of-materials. The VQFN-64 9x9 mm footprint is well suited to mezzanine cards where 4+ channels must fit in a 30x30 mm area. Designers typically pair it with a TI LMH6522 dual DVGA upstream and a Xilinx Artix-7 or Lattice ECP5 downstream for cost-sensitive multi-antenna receivers.
Được đề xuất
Handheld and Portable Test Equipment
The ADS4245IRGC25's 183 mW total power and 1.8 V single supply make it a strong fit for battery-powered oscilloscopes, spectrum analyzers, and signal-integrity probes. The 1.5 GHz analog input bandwidth supports undersampling of 1 GHz IF signals, eliminating a down-conversion stage, while the dual-channel architecture enables two simultaneous scope channels from a single IC. The 82 dBc SFDR guarantees clean dynamic range for spectral measurements. The industrial -40C to +85C operating range ensures reliable operation across factory-floor and field environments. The VQFN-64 PowerPAD provides low thermal resistance for sealed enclosures with no forced-air cooling, and the internal reference removes the need for a precision external reference that would otherwise consume board area.
Được đề xuất
Multi-Channel Data Acquisition System
Multi-channel industrial DAQ and acoustic-beamforming systems benefit from the ADS4245's dual-channel integration, low power, and 14-bit resolution. Two simultaneous 125 MSPS samples per IC cut the per-channel cost below that of single-channel ADCs while maintaining 82 dBFS SNR. The internal reference and small 9x9 mm VQFN footprint allow high channel density on a single board, supporting 8+ channels in 4 square inches. The CMOS or DDR LVDS output interface provides flexibility to drive either low-cost FPGAs (CMOS) or noise-immune backplanes (LVDS) over longer traces. Industrial temperature grade (-40C to +85C) and proven TI ultralow-power silicon make it a reliable choice for factory instrumentation, sonar arrays, and phased-array microphone systems.
Được đề xuất
Radar / Lidar IF Signal Processing
The ADS4245IRGC25 is widely used in radar and lidar intermediate-frequency digitization, where its 1.5 GHz input bandwidth and 82 dBc SFDR let designers sample 100-200 MHz IF signals directly with excellent spurious-free dynamic range. The dual-channel architecture supports simultaneous I/Q sampling of a single IF channel, simplifying I/Q imbalance calibration. Power consumption of 183 mW is low enough to deploy in phased-array radar sub-arrays that must stay within tight thermal envelopes, while the VQFN-64 package provides a low 31 C/W thermal resistance for sealed RF front-end enclosures. The internal reference removes a thermal-noise source that would otherwise degrade close-in dynamic range, critical for detecting small moving targets in the presence of large stationary clutter.
Được đề xuất
Medical Imaging Front End (Ultrasound / PET)
In ultrasound beamformers and PET detector front ends, the ADS4245IRGC25's dual-channel integration and 82 dBFS SNR are excellent for digitizing the output of multichannel preamps without sacrificing channel density. The 14-bit resolution at 125 MSPS meets the dynamic range required for low-contrast lesion detection in B-mode ultrasound, while the 183 mW per dual-channel power keeps the hundreds-of-channels system thermal load manageable. The internal reference and small 9x9 mm VQFN allow 64+ channels on a single 6-layer board. The industrial temperature range and TI's long-term product lifecycle support (>10 years) align with medical equipment certification cycles. Designers typically pair it with TI AFE5808A or THS4631 preamps and a TI KeyStone DSP or Xilinx Zynq Ultrascale processor.
Được đề xuất
Communications Test & Measurement (IQ Modem Tester)
The ADS4245IRGC25 is ideal for production-test equipment that needs to digitize I/Q modulator output, demodulated IF, or error-vector-magnitude (EVM) test signals. The dual-channel architecture is a natural fit for direct I/Q sampling at baseband or low IF, while the 82 dBFS SNR at 70 MHz supports measurement of 1024-QAM constellations with more than 40 dB of EVM headroom. The 1.5 GHz analog bandwidth allows direct sampling of L-band IF signals without a down-conversion stage, simplifying the tester architecture. The 183 mW power and small 9x9 mm VQFN enable high-density PXI / PXIe / LXI tester modules, and the CMOS output interface can directly drive a low-cost FPGA for real-time DSP. The industrial -40C to +85C range ensures calibration stability across production-floor temperature variations.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS4245IRGC25 — 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 | ADS4245IRGCT | ADS4246IRGC25 | ADS4225IRGC25 | ADS4245IRGCR | ADS62P48IRGC25 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | VQFN-64 (9x9) | VQFN-64 (9x9) - same | VQFN-64 (9x9) - same | VQFN-64 (9x9) - same | VQFN-64 (9x9) - same | VQFN-64 (9x9) - same |
| Resolution | 14 bit | 14 bit | 14 bit | 12 bit | 14 bit | 14 bit |
| Sample Rate (Max) | 125 MSPS | 125 MSPS | 160 MSPS | 125 MSPS | 125 MSPS | 200 MSPS |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 |
| Supply Voltage | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V |
| Power at Max Speed (CMOS) | 183 mW | 183 mW | 220 mW | 160 mW | 183 mW | 380 mW |
| SNR at 70 MHz | 82 dBFS | 82 dBFS | 82 dBFS | 71 dBFS | 82 dBFS | 84 dBFS |
| Internal Reference | Yes | Yes | Yes | Yes | Yes | Yes |
| Output Interface | CMOS / DDR LVDS | CMOS / DDR LVDS | CMOS / DDR LVDS | CMOS / DDR LVDS | CMOS / DDR LVDS | CMOS / DDR LVDS |
Bảo phân biệt quan trọng
- Lowest power in the ADS424x family at 125 MSPS (vsADS62P48IRGC25)
- Higher SNR than the 12-bit ADS4225IRGC25 (vsADS4225IRGC25)
- Identical pinout to ADS4246 upgrade path (vsADS4246IRGC25)
Ghi chú thiết kế
Decouple each AVDD pin with a 0.1 uF X7R ceramic placed within 2 mm, plus a 10 uF bulk capacitor on the analog supply plane. Separate AVDD and DRVDD planes should join only at one point near the IC to prevent digital switching noise from coupling into the analog front-end. The 1.8 V LDO powering DRVDD should have its own ferrite bead filter to keep switching noise below 1 mVrms, which is critical for meeting 82 dBFS SNR.
Estimated: at 125 MSPS CMOS output mode, the ADS4245IRGC25 dissipates 183 mW, and the VQFN-64 PowerPAD has a theta_JA of 31 C/W. Junction temperature rise above ambient is therefore 183 mW x 31 C/W = 5.7 C, well within the 125 C maximum. For sealed enclosures with no forced-air cooling, ensure the PCB has at least 4 square cm of 1 oz copper connected to the exposed pad, and solder the EPAD with a 4x4 thermal via array to the internal ground plane.
Route analog input traces as 50-ohm-controlled differential pairs with constant 100-ohm differential impedance, length-matched to within 0.5 mm. Keep CLK_P and CLK_N traces length-matched and isolated from the analog inputs by at least 3 trace widths to avoid clock-coupling spurs. Stitch the ground plane with vias on a 5 mm pitch around the IC perimeter, and do not route digital output traces (D0A-D13A) under the analog input section. For DDR LVDS output mode, route the LVDS pairs as 100-ohm differential and match within 0.1 mm.
Do not float the SEN pin at power-up; tie it high via a 10 kohm pull-up to DRVDD to keep the serial interface in a known state. Do not exceed 2.0 V on AVDD or DRVDD - the part is not 3.3 V tolerant. Avoid using the internal reference mode in systems with significant temperature transients (>20 C swing) if absolute full-scale accuracy below 1% is required; in that case, switch to external reference mode and use a precision ADR01 or REF198. Finally, do not apply analog input signals before powering up the AVDD supply, as this can permanently damage the input ESD structure.
Thông tin tuân thủ
RoHS and lead-free per TI product page. Industrial temperature grade (-40C to +85C), not AEC-Q100 qualified for automotive. Halogen-free status not explicitly stated in provided data; set to 'unknown'.
