AD7623ASTZRL - 16-Bit 1.33 MSPS PulSAR ADC | Analog Devices
MPN: AD7623ASTZRL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.78 | $257.80 |
| 100 | $23.12 | $2,312.00 |
| 500 | $20.85 | $10,425.00 |
| 1,000 | $18.9 | $18,900.00 |
AD7623ASTZRL Overview
A SAR ADC is a type of analog-to-digital converter that uses a charge redistribution capacitive DAC combined with a comparator and successive-approximation logic to digitize an analog input in N clock cycles, where N equals the converter's resolution. SAR ADCs sit in the broader taxonomy of data converters (ADC -> Nyquist-rate ADC -> SAR ADC -> mixed-signal IC). Unlike delta-sigma ADCs, SAR converters offer single-shot latency, deterministic throughput, and no pipeline delay, which makes them ideal for multiplexing multi-channel systems and control loops where latency must be predictable.
Key performance highlights include 1.33 MSPS throughput, 16-bit resolution with no missing codes, an excellent linearity profile, and a wide common-mode input range supported by the fully differential architecture. The AD8021 op amp is recommended by Analog Devices as the input driver because it settles cleanly at 16-bit levels at high gain. Combined with the 2.048 V internal reference, the AD7623 offers a high-accuracy single-supply solution for industrial instrumentation, medical imaging front-ends, and spectrum analysis systems.
Typical applications include industrial process control and data acquisition, medical imaging (CT, ultrasound, MRI front-ends), spectrum analysis and vibration analysis, multi-channel multiplexed data acquisition systems, and precision instrumentation where deterministic latency matters.
When designing with the AD7623, pay close attention to the input driver selection - the op amp must settle at 16-bit resolution (0.0015%) within the ADC acquisition time, not just at 0.1% or 0.01% which is more commonly published. Use a low-inductance ground plane and decouple the 2.5 V supply close to the pins. The LQFP-48 package has a typical θJA around 50 C/W; thermal rise is modest given the low supply current.
This page synthesizes distributor pricing, drop-in alternatives within the PulSAR family, and design notes drawn from the Analog Devices AD7623 datasheet - content not consolidated on any single distributor page.
Drop-in alternatives for AD7623ASTZRL — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD7623ASTZRL (same form factor and footprint) — differing in Architecture, Input Type, Package, Operating Temperature Range, Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7623ACPZRL
✅ Drop-In✓ In Stock
$20.8 / Unit
View Datasheet →AD7623ASTZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7622BSTZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7623ASTZRL Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Sample Rate | 1.33 MSPS |
| Architecture | SAR (charge redistribution) |
| Supply Voltage | 2.5 V (single) |
| Internal Reference | 2.048 V (typical ±7 ppm/°C drift) |
| Input Type | Fully differential analog input |
| Digital Interface | Parallel / Serial |
| Missing Codes | No missing codes at 16-bit level |
| Package | 48-pin LQFP (LFQFP) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40 °C to +85 °C (industrial) |
| Terminal Form | GULL WING |
| Package Code | LFQFP |
| Package Shape | SQUARE |
| Number of Terminals | 48 |
| Temperature Grade | INDUSTRIAL |
| RoHS Status | Compliant |
AD7623ASTZRL Pin Configuration
| Pin 1 | DVDD — Digital supply voltage (2.5 V) |
| Pin 2 | DGND — Digital ground |
| Pin 3 | OBD — Out-of-Bound detection output |
| Pin 4 | CS — Chip Select input |
| Pin 5 | RD — Read input (parallel mode) |
| Pin 6 | WR — Write / Start conversion input |
| Pin 7 | BUSY — Busy output (high during conversion) |
| Pin 8 | D15 — Parallel data output bit 15 (MSB) |
| Pin 9 | D14 — Parallel data output bit 14 |
| Pin 10 | D13 — Parallel data output bit 13 |
| Pin 11 | D12 — Parallel data output bit 12 |
| Pin 12 | D11 — Parallel data output bit 11 |
| Pin 13 | D10 — Parallel data output bit 10 |
| Pin 14 | D9 — Parallel data output bit 9 |
| Pin 15 | D8 — Parallel data output bit 8 |
| Pin 16 | DGND — Digital ground |
| Pin 17 | D7 — Parallel data output bit 7 |
| Pin 18 | D6 — Parallel data output bit 6 |
| Pin 19 | D5 — Parallel data output bit 5 |
| Pin 20 | D4 — Parallel data output bit 4 |
| Pin 21 | D3 — Parallel data output bit 3 |
| Pin 22 | D2 — Parallel data output bit 2 |
| Pin 23 | D1 — Parallel data output bit 1 |
| Pin 24 | D0 — Parallel data output bit 0 (LSB) |
| Pin 25 | SDOUT — Serial data output (serial mode) |
| Pin 26 | SCLK — Serial clock (serial mode) |
| Pin 27 | SER/PAR — Interface mode select |
| Pin 28 | RESET — Reset input |
| Pin 29 | PD — Power-down input |
| Pin 30 | REF — Reference decoupling / external reference input |
| Pin 31 | REFSENSE — Reference sense / select |
| Pin 32 | REFGND — Reference ground |
| Pin 33 | AVDD — Analog supply (2.5 V) |
| Pin 34 | AGND — Analog ground |
| Pin 35 | IN+ — Differential analog input positive |
| Pin 36 | IN- — Differential analog input negative |
| Pin 37 | AGND — Analog ground |
| Pin 38 | AVDD — Analog supply (2.5 V) |
| Pin 39 | CAPB — Reference buffer bypass capacitor |
| Pin 40 | CAPA — Reference buffer bypass capacitor |
| Pin 41 | REFOUT — Internal 2.048 V reference output |
| Pin 42 | REFGND — Reference ground |
| Pin 43 | DGND — Digital ground |
| Pin 44 | DVDD — Digital supply (2.5 V) |
| Pin 45 | NC — Not connected |
| Pin 46 | NC — Not connected |
| Pin 47 | NC — Not connected |
| Pin 48 | NC — Not connected |
Typical Applications
AD7623ASTZRL is suitable for 6 applications: Industrial Data Acquisition, Medical Imaging Front-End, Spectrum and Vibration Analysis, Precision Instrumentation, Multiplexed Multi-Channel Systems, Automatic Test Equipment (ATE).
Industrial Data Acquisition
The AD7623ASTZRL's 1.33 MSPS throughput and 16-bit no-missing-code resolution make it a strong fit for multi-channel industrial data acquisition systems sampling sensor bridges, RTDs, and strain gauges. Its SAR architecture provides deterministic latency per channel so muxed channels report in a known time, simplifying host timing. The single 2.5 V supply and internal 2.048 V reference shrink the analog front-end, while the 48-LQFP footprint leaves room for aggressive PCB routing on dense 4- or 8-channel boards.
Recommended
Medical Imaging Front-End
In medical imaging front-ends (CT, MRI receiver, ultrasound beamformer pre-DSP), the AD7623ASTZRL delivers the dynamic range and channel-to-channel synchronization demanded by high-resolution reconstruction. The 16-bit SAR core offers single-shot latency so beamformed samples align deterministically; the fully differential input rejects common-mode noise from long sensor cables. Using the AD8021 driver preserves 16-bit linearity at the front-end and avoids dynamic-range loss that would otherwise lower image contrast.
Recommended
Spectrum and Vibration Analysis
FFT-based spectrum and vibration analyzers depend on high dynamic range and clean spurious performance; the AD7623ASTZRL's 16-bit no-missing-code linearity keeps SFDR and SNR within usable bounds for vibration analysis on motors, bearings, and structural-health sensors. The 1.33 MSPS sample rate supports analysis up to ~600 kHz of input bandwidth under Nyquist. Pairing with an external anti-alias filter and the AD8021 driver creates a precision front-end with deterministic timing for synchronous sampling across multiple accelerometers.
Recommended
Precision Instrumentation
Bench-top precision instruments - DMMs, source-measure units, calibration equipment - benefit from the AD7623ASTZRL's 16-bit SAR performance and single 2.5 V supply that reduces rail-count and thermal footprint inside tightly-packaged instruments. The internal ±7 ppm/°C reference gives good temperature stability without external reference overhead. The 48-LQFP package allows dense layout next to the analog front-end while keeping digital lines short, which is critical for EMI-sensitive measurement chains.
Recommended
Multiplexed Multi-Channel Systems
In multiplexed data acquisition systems scanning 8, 16, or more channels, the AD7623ASTZRL's SAR architecture avoids the latency penalty of pipeline ADCs so each channel is sampled in a known number of clock cycles. The 1.33 MSPS throughput combined with an external mux like the ADG1408 supports aggregate per-channel rates well above 100 kSPS even on 8-channel boards. The parallel output mode gives lowest deterministic latency, while the serial mode simplifies opto-isolation in industrial systems where channel count is high.
Recommended
Automatic Test Equipment (ATE)
ATE systems for semiconductor test need fast, deterministic ADC conversion to keep per-pin test times short. The AD7623ASTZRL's 1.33 MSPS SAR throughput, 16-bit no-missing-code resolution, and parallel output mode fit the per-device parametric test pattern where each channel must produce a settled result in microseconds. The single 2.5 V supply simplifies ATE pin-electronics power trees, and the integrated 2.048 V reference removes one external component from the BOM - a meaningful saving on multi-site test heads.
Recommended
Recommended Products Summary
Engineering reference data for AD7623ASTZRL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7623ACPZRL | AD7623ASTZ | AD7622BSTZ |
|---|---|---|---|---|
| Package | 48-LQFP (LFQFP) | 48-LQFP (LFQFP) - same | 48-LQFP (LFQFP) - same | 48-LQFP (LFQFP) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit |
| Sample Rate | 1.33 MSPS | 1.33 MSPS | 1.33 MSPS | 0.5 MSPS |
| Architecture | SAR | SAR | SAR | SAR |
| Supply Voltage | 2.5 V single | 2.5 V single | 2.5 V single | 2.5 V single |
| Internal Reference | 2.048 V internal | 2.048 V internal | 2.048 V internal | 2.048 V internal |
| Digital Interface | Parallel / Serial | Parallel / Serial | Parallel / Serial | Parallel / Serial |
| Operating Temperature | -40 °C to +85 °C | Different temp grade; verify | -40 °C to +85 °C | -40 °C to +85 °C |
Key Differentiators
- 1.33 MSPS is the fastest PulSAR speed grade in the 48-LQFP family (vs AD7622BSTZ)
- No missing codes at 16-bit level (vs AD7622BSTZ)
- Single 2.5 V supply with internal reference simplifies BOM (vs External reference designs)
Design Notes
The input driver op amp must settle at the 16-bit level (0.0015%) within the ADC acquisition time - NOT the 0.1% or 0.01% level commonly published on amplifier datasheets. The AD8021 is the recommended driver because it maintains this settling even at gain of 10. Verify driver settling with the actual signal swing, not just datasheet typical values.
Place decoupling capacitors directly on AVDD, DVDD, and REFOUT pins using a low-inductance ground plane. Separate analog (AGND, REFGND) and digital (DGND) grounds and join them at a single point near the ADC. Keep digital data lines short and routed away from IN+ and IN- to minimize coupled noise into the analog front-end.
Do not assume the input driver settles just because the amplifier datasheet claims 0.1% settling. At 16-bit resolution the actual settling target is 0.0015%, which most general-purpose op amps do not meet. Use the AD8021 or AD8476 for guaranteed 16-bit settling. Also ensure CAPA and CAPB reference-buffer bypass capacitors are placed close to the pins per datasheet.
Compliance Information
RoHS and REACH compliance per Analog Devices product page. Not AEC-Q100 qualified - this is an industrial-grade part.
