Part A
AD7982BRMZRL7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4697 個数
- Package
- MSOP-10
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7989-5BRMZ and AD7982BRMZRL7 are both 18-bit, 1 MSPS successive-approximation ADCs in a 10-lead MSOP package with a pseudo-differential input and SPI-compatible serial interface, making them strong functional replacement candidates. The primary distinction is the analog input range: the AD7989-5 operates from a 5 V reference with a 0 V to VREF unipolar input span, while the AD7982 uses a 5 V reference with a fully differential ±VREF input range. Designers must confirm the input configuration and reference arrangement match the target application before substituting.
Resolution and Sample Rate
High match
Package Type
High match
Input Configuration
Validation required
Digital Interface
High match
Parts at a glance
Part B
AD7989-5BRMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6297 個数
- Package
- MSOP-10
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7989-5BRMZ | AD7982BRMZRL7 | Why it matters |
|---|---|---|---|
| Resolution | 18 bit | 18 bit | Both are 18-bit SAR ADCs, so resolution alone does not distinguish them for substitutability. |
| Sampling Rate | 500 kSPS | 1 MSPS | The AD7982 offers twice the throughput, which matters for higher-bandwidth signal acquisition. |
| Input Type | Differential (pseudo-differential/full differential) | Differential | Input configuration affects how the ADC interfaces with the sensor or front-end amplifier. |
| Analog Supply Voltage | 5 V | 5 V | Matching analog supply simplifies power-rail design when swapping parts. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | A common serial interface allows reuse of the same digital host and firmware. |
| Package | 10-lead MSOP (RMZ) | 10-lead MSOP (RMZ) | Identical package footprint enables drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature ratings ensure the same environmental qualification applies. |
| Power Consumption | Lower power (500 kSPS variant) | Higher power (1 MSPS variant) | Power budget and thermal design differ between the two speed grades. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7982BRMZRL7 | AD7989-5BRMZ |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 18 | 18 |
| Sampling Rate(Per Second) | 1M | 500k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.375V ~ 2.625V | 2.375V ~ 2.625V |
| Voltage - Supply, Digital | 2.375V ~ 2.625V | 2.375V ~ 2.625V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7989-5BRMZ and the AD7982BRMZRL7?
The AD7989-5BRMZ is a 18-bit, 500 kSPS PulSAR ADC with a differential input, while the AD7982BRMZRL7 is an 18-bit, 1 MSPS PulSAR ADC with a differential input. The AD7982 offers twice the throughput of the AD7989-5, and both are specified for operation from a 2.5 V to 5 V supply with a separate VIO supply. The AD7989-5 includes a digital gain/offset feature not present on the AD7982.
Are the AD7989-5BRMZ and AD7982BRMZRL7 pin-compatible?
Both devices are offered in a 10-lead MSOP (RMZ) package and share the same pinout for the core ADC functions (VDD, VIO, GND, IN+, IN-, REF, CNV, SDI, SDO, SCK). However, the AD7989-5 includes additional digital gain/offset configuration capability accessed via the SDI pin, so firmware and configuration must be validated before substituting one for the other.
What is the maximum sampling rate of each device?
The AD7989-5BRMZ supports a maximum throughput of 500 kSPS. The AD7982BRMZRL7 supports a maximum throughput of 1 MSPS. The higher throughput of the AD7982 makes it suitable for faster signal chains, while the AD7989-5 targets lower-speed, higher-precision applications.
Do both ADCs use the same external reference voltage?
Yes. Both the AD7989-5 and AD7982 use an external reference applied to the REF pin, with a specified reference range of 2.5 V to 5.0 V. The analog input range is 0 V to VREF for both devices, so the same reference source can be used in either design.
What are the power supply requirements for these ADCs?
Both devices operate from an analog supply (VDD) of 2.5 V to 5 V and a separate digital I/O supply (VIO) of 1.8 V to 5 V, allowing direct interfacing to low-voltage logic. Power consumption scales with throughput; the AD7982 at 1 MSPS draws more supply current than the AD7989-5 at 500 kSPS under equivalent conditions.
What digital interface do the AD7989-5BRMZ and AD7982BRMZRL7 use?
Both devices use a SPI-compatible serial interface with CNV, SCK, SDI, and SDO pins, supporting daisy-chain and busy-indicator modes. The AD7989-5 additionally uses the SDI pin for digital gain/offset register access, whereas on the AD7982 the SDI pin is used for mode selection only.
Can the AD7989-5BRMZ be used as a drop-in replacement for the AD7982BRMZRL7 in an existing design?
Not without validation. Although both are 18-bit differential PulSAR ADCs in a 10-lead MSOP, the AD7982 supports 1 MSPS versus 500 kSPS for the AD7989-5, and the AD7989-5 adds digital gain/offset configuration via SDI. Timing, firmware, and throughput requirements must be verified against the respective datasheets before substitution.
What are the typical applications for each device?
The AD7982BRMZRL7, with its 1 MSPS throughput, suits higher-speed data acquisition, medical imaging, and vibration analysis. The AD7989-5BRMZ, with its 500 kSPS rate and digital gain/offset capability, suits precision industrial measurement, process control, and applications requiring calibrated offset/gain correction in the digital domain.