Part A
AD7663ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5007 PCS
- Package
- LQFP-48
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7667AST is a strong functional replacement candidate for the AD7663ASTZ, sharing the same 16-bit SAR architecture, 500 kSPS throughput, and 48-lead LQFP footprint. Designers should validate the analog input configuration and digital interface timing against the target application before committing to the substitution.
Resolution and Throughput
High match
Package and Pinout
High match
Analog Input Configuration
Validation required
Digital Interface Timing
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7663ASTZ | AD7667AST | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 16 bits | Both are 16-bit SAR ADCs, so resolution is identical and not a differentiator for substitutability. |
| Sampling Rate | 250 kSPS | 1 MSPS | The AD7667 offers 4x the throughput, which matters for higher-bandwidth signal acquisition and faster multiplexed systems. |
| Number of Input Channels | 2 (differential/single-ended) | 1 (differential/single-ended) | The AD7663 supports two input channels, enabling multiplexed multi-signal acquisition that the single-channel AD7667 cannot do without external muxing. |
| Input Type | Differential, pseudo-differential, single-ended | Differential, pseudo-differential, single-ended | Both support the same input configurations, so signal conditioning requirements are equivalent. |
| Supply Voltage (Analog) | 5 V | 5 V | Identical analog supply simplifies power rail design when swapping parts. |
| Interface | Parallel and Serial (SPI/QSPI/MICROWIRE/DSP) | Parallel and Serial (SPI/QSPI/MICROWIRE/DSP) | Both offer the same digital interface options, so host-side firmware and layout are compatible. |
| Package | 48-Lead LQFP | 48-Lead LQFP | Identical package and pinout family allows drop-in board compatibility. |
| Power Consumption | Typical 87 mW at 250 kSPS | Typical 130 mW at 1 MSPS | The higher-speed AD7667 dissipates more power, which affects thermal budget and supply sizing in portable or dense designs. |
| INL (Integral Nonlinearity) | ±2.5 LSB max | ±2.5 LSB max | Matching linearity specs means both meet the same accuracy class for precision measurement applications. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature range supports the same environmental qualification. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7663ASTZ | AD7667AST |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 250k | 1M |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 1 | - |
| Input Type | Differential | - |
| Data Interface | SPI, Parallel, DSP | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Architecture | SAR | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
| Features | True Bipolar | - |
Frequently asked questions
What are the key differences between the AD7663ASTZ and the AD7667AST?
The AD7663ASTZ is a 16-bit, 250 kSPS bipolar input successive-approximation ADC, while the AD7667AST is a 16-bit, 1 MSPS unipolar input SAR ADC. The AD7663ASTZ offers higher throughput and supports true bipolar input ranges, whereas the AD7667AST provides a unipolar 0 V to VREF input range with a faster 1 MSPS sampling rate. Both are housed in 48-lead LQFP packages but differ in input architecture and speed grade.
Are the AD7663ASTZ and AD7667AST pin-compatible?
Both devices are offered in a 48-lead LQFP (ST-48) package, but pin compatibility must be verified against the respective manufacturer pinout diagrams. The AD7663ASTZ and AD7667AST share the same package footprint, yet differences in analog input configuration and reference connections mean a direct drop-in replacement should only be attempted after confirming pin functions in the official Analog Devices datasheets.
What are the input voltage ranges of the AD7663ASTZ and AD7667AST?
The AD7663ASTZ supports true bipolar input ranges of ±10 V, ±5 V, and ±2.5 V, making it suitable for applications requiring negative signal swing. The AD7667AST provides a unipolar input range of 0 V to VREF (with VREF typically 2.5 V), suited to single-supply, positive-only signal chains. The choice between them depends on whether the sensor or signal source produces bipolar or unipolar outputs.
How do the sampling rates of the AD7663ASTZ and AD7667AST compare?
The AD7663ASTZ offers a maximum throughput of 250 kSPS, while the AD7667AST achieves 1 MSPS. The AD7667AST is therefore better suited to higher-bandwidth signals and multiplexed multi-channel systems requiring faster per-channel conversion, whereas the AD7663ASTZ targets precision bipolar measurements at moderate speeds.
Do the AD7663ASTZ and AD7667AST use the same digital interface?
Both devices provide a parallel digital interface and support serial communication modes, but the exact interface timing, word length options, and configuration registers differ between the two datasheets. Designers should consult the Analog Devices datasheets for the AD7663ASTZ and AD7667AST to confirm timing parameters, read/write strobe requirements, and bus-width configuration before reusing an existing digital interface design.
What are the typical applications for the AD7663ASTZ versus the AD7667AST?
The AD7663ASTZ is typically used in bipolar signal acquisition such as industrial process control, instrumentation, and data acquisition systems where ±10 V or ±5 V inputs are common. The AD7667AST is typically applied in unipolar, higher-speed systems such as medical imaging front ends, spectrum analyzers, and multiplexed data acquisition where 1 MSPS throughput and 0 V to VREF inputs are appropriate.
Can the AD7663ASTZ and AD7667AST operate from the same supply voltages?
Both devices operate from a 5 V analog supply and a 2.7 V to 5.25 V digital supply, per their respective Analog Devices datasheets. However, because the AD7663ASTZ handles bipolar inputs, its analog front-end and reference configuration differ from the unipolar AD7667AST, so supply decoupling and reference buffering should be designed according to each device's specific recommendations.
Which device offers better AC performance, the AD7663ASTZ or the AD7667AST?
AC performance specifications such as SINAD and THD are defined individually in each datasheet and depend on input range, reference, and sampling rate. The AD7667AST, with its 1 MSPS throughput, is specified for AC characteristics at higher sampling frequencies, while the AD7663ASTZ is specified for its 250 kSPS bipolar operation. Designers should compare the SINAD and THD curves in the official Analog Devices datasheets for the specific input range and frequency of interest rather than assuming one device is universally superior.