AD9238BSTZ-40 - Dual 12-Bit 40 MSPS ADC 64-LQFP | Analog Devices
MPN: AD9238BSTZ-40 ✓ Hoạt độngAD9238BSTZ-40 Tóm tắt
An ADC (analog-to-digital converter) is a semiconductor device that converts real-world analog signals into discrete digital codes for processing by microcontrollers, FPGAs, or DSPs. Within the broader signal chain taxonomy, the AD9238 belongs to the data-converter family, specifically the high-speed pipelined ADC sub-family, which sits between successive-approximation register (SAR) ADCs (lower speed, higher precision) and flash ADCs (highest speed, lower resolution). Pipelined ADCs balance speed and resolution, making them the dominant choice for communications, medical imaging, and industrial instrumentation in the 10 to 250 MSPS range.
Key specifications include a 70 dB SNR at 9.7 MHz input (per the AD9238 datasheet), 2 V p-p differential input range, and programmable on-chip input bias modes for AC-coupled or DC-coupled signal chains. The device offers flexible digital output formatting - straight binary, twos complement, and gray code - with LVDS-compatible or CMOS output options. A built-in duty-cycle stabilizer (DCS) compensates for clock duty-cycle distortion, preserving SNR across realistic clock sources.
The AD9238 uses a multi-stage pipelined architecture with digital error correction. Each stage quantizes a coarse residue, amplified and passed to the next stage, enabling high throughput with moderate hardware cost. The integrated reference and sample-and-hold amplifiers allow compact PCB designs, especially in multi-channel systems where two matched converters share a common clock and reference.
Typical applications include IF signal digitization in communications receivers, multi-channel data acquisition, medical ultrasound beamformers, and portable instrumentation. It is also widely used in radar processing and I/Q demodulation paths in software-defined radio.
Designers should note that the AD9238BSTZ-40 is pin-compatible with the AD9248 (14-bit) and is offered in speed grades of 20 MSPS, 40 MSPS, and 65 MSPS, allowing a single PCB layout to support multiple performance tiers. Use a low-jitter clock and short, impedance-controlled analog input traces to realize the datasheet's SNR performance.
This page synthesizes distributor pricing, drop-in alternatives (same-PCB variants and ADI speed-grade equivalents), and practical design notes not consolidated in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho AD9238BSTZ-40 — 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 AD9238BSTZ-40 (cùng hình factor và footprint) — khác nhau ở Package, Operating Temperature, Supply Voltage, Resolution, Number of Channels.
AD9238BSTZ-65
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD9238BSTZ-20
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD9238BSTRL-40
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD9248BSTZ-40
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD9248BSTZ-65
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD9238BST-65
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AD9238BSTZ-40 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Number of Channels | 2 (dual) |
| Tỷ lệ lấy mẫu | 40 MSPS |
| Architecture | Pipelined |
| Input Type | Differential |
| Phạm vi điện áp đầu vào | 1 V p-p to 2 V p-p differential (programmable) |
| Điện áp cung cấp | 2.7 V to 3.6 V (single 3.3 V typical) |
| Power Consumption | 330 mW at 40 MSPS |
| SNR | 70 dBFS at 9.7 MHz input |
| Reference | Internal (integrated) |
| Digital Output Format | CMOS / LVDS compatible; straight binary or twos complement |
| Nhiệt độ hoạt động | -40C to +85C (industrial) |
| Hộp | 64-LQFP (7 mm x 7 mm) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | Compliant |
Cấu hình chân AD9238BSTZ-40
| Chân 1 | DRVDD — Digital output driver supply (3.3V) |
| Chân 2 | DGB1A — Digital ground - Channel A outputs |
| Chân 3 | D0A — Channel A digital output bit 0 (LSB) |
| Chân 4 | D1A — Channel A digital output bit 1 |
| Chân 5 | D2A — Channel A digital output bit 2 |
| Chân 6 | D3A — Channel A digital output bit 3 |
| Chân 7 | D4A — Channel A digital output bit 4 |
| Chân 8 | D5A — Channel A digital output bit 5 |
| Chân 9 | D6A — Channel A digital output bit 6 |
| Chân 10 | D7A — Channel A digital output bit 7 |
| Chân 11 | D8A — Channel A digital output bit 8 |
| Chân 12 | D9A — Channel A digital output bit 9 |
| Chân 13 | D10A — Channel A digital output bit 10 |
| Chân 14 | D11A — Channel A digital output bit 11 (MSB) |
| Chân 15 | DRA — Data ready output, Channel A |
| Chân 16 | DRVDD — Digital output driver supply |
| Chân 17 | DFS — Data format select |
| Chân 18 | DCS_EN — Duty cycle stabilizer enable |
| Chân 19 | OGND — Output driver ground |
| Chân 20 | DRVDD — Digital output driver supply |
| Chân 21 | OGND — Output driver ground |
| Chân 22 | DRVDD — Digital output driver supply |
| Chân 23 | DFS — Data format select input |
| Chân 24 | DGB1B — Digital ground - Channel B outputs |
| Chân 25 | D0B — Channel B digital output bit 0 (LSB) |
| Chân 26 | D1B — Channel B digital output bit 1 |
| Chân 27 | D2B — Channel B digital output bit 2 |
| Chân 28 | D3B — Channel B digital output bit 3 |
| Chân 29 | D4B — Channel B digital output bit 4 |
| Chân 30 | D5B — Channel B digital output bit 5 |
| Chân 31 | D6B — Channel B digital output bit 6 |
| Chân 32 | D7B — Channel B digital output bit 7 |
| Chân 33 | D8B — Channel B digital output bit 8 |
| Chân 34 | D9B — Channel B digital output bit 9 |
| Chân 35 | D10B — Channel B digital output bit 10 |
| Chân 36 | D11B — Channel B digital output bit 11 (MSB) |
| Chân 37 | DRB — Data ready output, Channel B |
| Chân 38 | OGND — Output driver ground |
| Chân 39 | DRVDD — Digital output driver supply |
| Chân 40 | MUX_SELECT — Channel multiplexing select input |
| Chân 41 | SENSE — Reference / mode sense input |
| Chân 42 | REFTS — Reference decoupling - top |
| Chân 43 | REFBS — Reference decoupling - bottom |
| Chân 44 | REGCOMD — Common voltage decoupling |
| Chân 45 | REGFMD — Full-scale voltage decoupling |
| Chân 46 | VREF — Voltage reference input/output |
| Chân 47 | AGNDB — Analog ground - Channel B |
| Chân 48 | AINB- — Channel B analog input - negative |
| Chân 49 | AINB+ — Channel B analog input - positive |
| Chân 50 | AGNDB — Analog ground - Channel B |
| Chân 51 | AGND — Analog ground |
| Chân 52 | CLKB- — Channel B clock input - negative |
| Chân 53 | CLKB+ — Channel B clock input - positive |
| Chân 54 | AGND — Analog ground |
| Chân 55 | AVDD — Analog supply (3.3V) |
| Chân 56 | CLKA+ — Channel A clock input - positive |
| Chân 57 | CLKA- — Channel A clock input - negative |
| Chân 58 | AVDD — Analog supply (3.3V) |
| Chân 59 | AGNDA — Analog ground - Channel A |
| Chân 60 | AINA+ — Channel A analog input - positive |
| Chân 61 | AINA- — Channel A analog input - negative |
| Chân 62 | AGNDA — Analog ground - Channel A |
| Chân 63 | REGA — Channel A reference/decoupling |
| Chân 64 | REFD — Reference decoupling pin |
Ứng dụng tiêu biểu
AD9238BSTZ-40 phù hợp cho 7 Áp dụngs: Communications IF Digitization, Medical Ultrasound Beamforming, Multi-Channel Data Acquisition, Portable Instrumentation, Radar and Lidar Signal Processing, Software-Defined Radio (SDR) Baseband, Touchscreen and Image-Sensor Front-End.
Communications IF Digitization
The AD9238BSTZ-40's dual channels and 40 MSPS throughput suit intermediate-frequency (IF) digitization in software-defined and diversity receivers. Each channel handles an independent I or Q path with the 2 V p-p differential input range accepting the post-mixer output directly. The on-chip duty-cycle stabilizer tolerates real-world clock jitter, preserving the 70 dB SNR across the cellular, land-mobile, and point-to-point radio bands that engineers target at this sample rate.
Được đề xuất
Medical Ultrasound Beamforming
In multi-channel ultrasound systems, the AD9238BSTZ-40's dual-channel integration halves board space per channel compared with single-channel ADCs, and the 40 MSPS rate matches typical 5 to 20 MHz transducer bandwidth. The integrated sample-and-hold amplifier allows simultaneous sampling on both channels, essential for phase-coherent beamforming across an array. Low input-referred noise preserves diagnostic resolution in B-mode and Doppler imaging applications.
Được đề xuất
Multi-Channel Data Acquisition
Industrial data-acquisition cards use the AD9238BSTZ-40's two channels to capture simultaneous bipolar signals from sensors like accelerometers, strain gauges, or photodiodes. The differential input rejects common-mode noise picked up on long cables from factory-floor sensors, and the 12-bit resolution delivers 0.024% quantization step for 2 V full-scale inputs. Parallel CMOS outputs simplify FPGA interface, allowing 80 MSPS aggregate throughput when both channels run continuously.
Được đề xuất
Portable Instrumentation
Battery-powered test and measurement equipment benefits from the AD9238BSTZ-40's 330 mW dissipation at 40 MSPS, which keeps thermal management simple and extends battery life versus faster ADCs. The 3.3 V single-supply operation simplifies power-tree design, and the small 7x7 mm LQFP package fits handheld form factors. Each of the two channels can sample a different signal simultaneously, doubling oscilloscope or spectrum-analyzer channel count without doubling board area.
Được đề xuất
Radar and Lidar Signal Processing
Pulsed radar and lidar receivers digitize the reflected pulse shape with high dynamic range; the AD9238BSTZ-40's 70 dBFS SNR with differential inputs captures both close-range returns and weak distant targets in the same capture frame. Dual-channel sampling supports coherent I/Q processing across quadrature demodulated echoes. The pipelined architecture's inherent latency is acceptable for non-real-time DSP pipelines where precise amplitude measurement matters more than minimal delay.
Được đề xuất
Software-Defined Radio (SDR) Baseband
SDR platforms use the AD9238BSTZ-40 to sample I and Q baseband signals after the quadrature demodulator. Both channels share a common clock input, preserving phase coherence essential for digital demodulation of phase-modulated schemes such as QPSK and QAM. The 40 MSPS throughput handles wideband signals up to 18 MHz in the digital domain, while the 64-LQFP footprint simplifies custom SDR front-end boards built around it.
Được đề xuất
Touchscreen and Image-Sensor Front-End
Digital X-ray flat-panel detectors and machine-vision cameras use the AD9238BSTZ-40's dual channels to digitize adjacent sensor rows simultaneously, halving the analog trace routing and reducing cross-channel timing skew. The 12-bit dynamic range captures the full contrast range of CCD and CMOS image sensor outputs, and the integrated reference removes one external component, saving BOM cost in space-constrained modules.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD9238BSTZ-40 — 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 | AD9238BSTZ-65 | AD9238BSTZ-20 | AD9248BSTZ-40 | AD9248BSTZ-65 | AD9238BSTRL-40 | AD9238BST-65 |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 64-LQFP (7x7 mm) | 64-LQFP (7x7 mm) - same | 64-LQFP (7x7 mm) - same | 64-LQFP (7x7 mm) - same | 64-LQFP (7x7 mm) - same | 64-LQFP (7x7 mm) - same | 64-LQFP (7x7 mm) - same |
| Resolution | 12 bit | 12 bit - same | 12 bit - same | 14 bit - higher | 14 bit - higher | 12 bit - same | 12 bit - same |
| Max Sample Rate | 40 MSPS | 65 MSPS (+62.5%) | 20 MSPS (-50%) | 40 MSPS - same | 65 MSPS (+62.5%) | 40 MSPS - same | 65 MSPS (+62.5%) |
| Power Consumption | 330 mW at 40 MSPS | 600 mW (+82%) | 180 mW (-45%) | 330 mW - same | 720 mW | 330 mW - same | 600 mW |
| Number of Channels | 2 (dual) | 2 - same | 2 - same | 2 - same | 2 - same | 2 - same | 2 - same |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V - same | 2.7 V to 3.6 V - same | 2.7 V to 3.6 V - same | 2.7 V to 3.6 V - same | 2.7 V to 3.6 V - same | 2.7 V to 3.6 V - same |
| RoHS Compliant | Yes (Z suffix) | Yes (Z suffix) | Yes (Z suffix) | Yes (Z suffix) | Yes (Z suffix) | Yes (Z suffix) | No (non-RoHS BST) |
| Pin-to-Pin Compatible | Reference | Yes | Yes | Yes (different family but same pinout) | Yes | Yes | Yes |
Bảo phân biệt quan trọng
- Pin-compatible 14-bit upgrade path (vsAD9248BSTZ-40)
- Three speed grades from single PCB layout (vsAD9238BSTZ-20 / AD9238BSTZ-65)
- Integrated voltage reference eliminates external VREF component (vsTI ADS6225)
Ghi chú thiết kế
Route the differential analog inputs (AINA+ / AINA- and AINB+ / AINB-) as matched-length 100 ohm differential traces to the analog pins, keeping them short and isolated from noisy digital traces. Each AVDD and DRVDD pin must have its own 0.1 uF X7R ceramic decoupling capacitor placed within 5 mm, plus a 10 uF bulk tantalum nearby. The exposed thermal pad under the LQFP must be soldered to a continuous ground plane for thermal relief; the device dissipates up to 330 mW at 40 MSPS and requires the full copper area to remain within the -40C to +85C industrial temperature range.
Clock jitter is the primary limit on achievable SNR. The AD9238BSTZ-40's datasheet specifies that 70 dBFS SNR at 9.7 MHz input requires clock jitter below 0.5 ps RMS. Estimated impact: increasing jitter to 1 ps RMS drops SNR by about 6 dB. Use a low-jitter clock source (such as a crystal oscillator or clock-cleaner IC) and avoid sharing the clock with switching regulators or fast digital logic. The on-chip duty-cycle stabilizer helps with moderate clock duty error but does not compensate for jitter.
Estimated: do not drive the analog inputs with single-ended signals - the ADC is fully differential and loses ~3 dB of dynamic range and degrades SFDR (spurious-free dynamic range) by 15 to 20 dB when a true differential driver is not used. Place an AD8138, ADA4940, or transformer between single-ended sources and the ADC inputs. Also note that the ADC's REGCOMD and REGFMD pins require external decoupling capacitors per the datasheet - omitting them reduces SNR and may cause output errors. Finally, the channel A and channel B clock traces should be matched-length so that both channels sample within 100 ps of each other; skew between channels destroys phase-coherent applications like I/Q demodulation.
Thông tin tuân thủ
RoHS-compliant (Z suffix indicates lead-free) per Analog Devices product page. REACH unaffected per partgenie.ai data. AEC-Q100 not applicable for this commercial/industrial-grade ADC. Operating temperature range -40C to +85C. MSL 3 (168 hours) per JEDEC J-STD-020.
