AD7327TRU-EP-RL7 - 12-Bit+Sign 500kSPS 8-Ch ADC | Analog Devices
MPN: AD7327TRU-EP-RL7 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $32.5 | $32.50 |
| 10 | $29.25 | $292.50 |
| 100 | $26.1 | $2,610.00 |
| 500 | $23.4 | $11,700.00 |
| 1,000 | $21.05 | $21,050.00 |
AD7327TRU-EP-RL7 Overview
A SAR (Successive-Approximation Register) ADC is a type of data converter that resolves a single analog sample by performing one conversion decision per clock cycle against an internal precision DAC and comparator, then delivering a fully settled digital code within N cycles for an N-bit output. SAR ADCs sit within the broader hierarchy of analog-to-digital converter -> data converter -> mixed-signal IC -> semiconductor, and are favored for applications that demand low latency, deterministic throughput, and DC precision without the pipeline delay of higher-speed flash or pipelined architectures.
Key features of the AD7327TRU-EP-RL7 include software-selectable input ranges of ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V on every channel, true bipolar operation on each input, an external reference option via the REFIN/OUT pin that extends the input range to ±12 V when a 3 V reference is applied, an integrated 8-channel MUX with simultaneous sample-and-hold in a 1:1 S/H-to-ADC ratio, and a sequencer that simplifies multi-channel scanning. The device operates from a 2.7 V to 5.25 V digital supply and ±12 V to ±16.5 V analog supplies, drawing typical power in the low-mA range, and includes software-configurable output coding in two's complement, straight binary, or sign-magnitude formats.
The AD7327-EP is implemented on Analog Devices' iCMOS (industrial CMOS) process technology, which combines high-voltage bipolar transistors with sub-micron CMOS to deliver true bipolar ±10 V or higher input swings on a single 5 V supply. This process allows the converter to be used directly at industrial signal levels without external signal conditioning or level shifting, while keeping power and package size compact for space-constrained designs.
Typical applications include industrial process control and PLC analog input modules, multichannel data acquisition front ends, defense and aerospace signal conditioning, motor control current/voltage monitoring, and any system requiring true bipolar measurement on multiple channels with deterministic throughput. The wide bipolar input range, channel-by-channel software configurability, and -EP qualification make the part particularly suited to ruggedized multi-channel measurement.
When designing with this device, ensure the analog and digital supplies are decoupled close to the pins with a 0.1 µF and 10 µF combination, sequence the analog supply before or simultaneously with the digital supply to avoid latch-up, and configure the input range register per channel before initiating conversion. The REFIN/OUT pin can be left as an internal 2.5 V reference or overdriven externally up to 3 V for ±12 V input range.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a faster procurement and replacement workflow for the AD7327TRU-EP-RL7.
Drop-in alternatives for AD7327TRU-EP-RL7 — 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 AD7327TRU-EP-RL7 (same form factor and footprint) — differing in Operating Temperature Range, Package, Sampling Rate, Analog Supply Voltage, Data Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7327TRUZ-EP-RL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7327TRUZ-EP
✅ Drop-In📋 Reference alternative (not in catalog)
AD7327BRUZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7327BRUZ
✅ Drop-In✓ In Stock
$3.79 / Unit
View Datasheet →AD7328BRUZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7327TRU-EP-RL7 Maximum Ratings & Electrical Characteristics
| Number of Bits | 12 bit + sign |
| Sampling Rate | 500 kSPS |
| Number of Inputs | 2, 3, or 4 (8-channel MUX) |
| Input Type | Differential, Pseudo-Differential, Single-Ended |
| Data Interface | SPI, DSP-compatible serial |
| Configuration | MUX-S/H-ADC |
| Ratio S/H:ADC | 1:1 |
| Architecture | SAR |
| Input Voltage Range | ±10 V, ±5 V, ±2.5 V, 0 to +10 V (software-selectable per channel); ±12 V with external 3 V reference |
| Analog Supply Voltage | ±12 V to ±16.5 V |
| Digital Supply Voltage | 2.7 V to 5.25 V |
| Operating Temperature Range | -55 °C to +125 °C (military, -EP grade) |
| Package | 20-pin TSSOP (RU) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel, 7-inch reel (RL7) |
| Process Technology | iCMOS |
| Reference | Internal 2.5 V or external up to 3 V on REFIN/OUT |
| Qualification | AQEC standard, defense/aerospace (-EP), DSCC drawing V62/14636 |
| Output Coding | Two's complement, straight binary, or sign-magnitude (software-selectable) |
AD7327TRU-EP-RL7 Pin Configuration
| Pin 1 | AVCC — Analog positive supply (+12 V to +16.5 V) |
| Pin 2 | AGND — Analog ground |
| Pin 3 | REFIN/OUT — Reference input/output (internal 2.5 V or external up to 3 V) |
| Pin 4 | VINA0 — Analog input channel 0 |
| Pin 5 | VINA1 — Analog input channel 1 |
| Pin 6 | VINA2 — Analog input channel 2 |
| Pin 7 | VINA3 — Analog input channel 3 |
| Pin 8 | VINA4 — Analog input channel 4 |
| Pin 9 | VINA5 — Analog input channel 5 |
| Pin 10 | VINA6 — Analog input channel 6 |
| Pin 11 | VINA7 — Analog input channel 7 |
| Pin 12 | GND — Ground |
| Pin 13 | DOUT — Serial data output (SPI/DSP) |
| Pin 14 | DIN — Serial data input |
| Pin 15 | SCLK — Serial clock |
| Pin 16 | CS — Chip select (active low) |
| Pin 17 | DGND — Digital ground |
| Pin 18 | DVDD — Digital supply (2.7 V to 5.25 V) |
| Pin 19 | RANGE — Range select / sequence control |
| Pin 20 | CONVST — Conversion start |
Typical Applications
AD7327TRU-EP-RL7 is suitable for 6 applications: Industrial Process Control and PLC Analog Input Modules, Multichannel Data Acquisition Systems, Defense and Aerospace Signal Conditioning, Motor Control Current and Voltage Monitoring, Power Line and Energy Metering, Medical Patient Monitoring and Instrumentation.
Industrial Process Control and PLC Analog Input Modules
The AD7327TRU-EP-RL7 fits PLC analog input modules because its 8 input channels accept true bipolar ±10 V, ±5 V, ±2.5 V, or 0-10 V signals directly from industrial transducers (4-20 mA loops, ±10 V actuators) without external signal conditioning. With 500 kSPS throughput and software-configurable ranges per channel, a single IC replaces multiple discrete ADCs and front-end op-amps. The ±12 V to ±16.5 V analog supply headroom handles industrial 24 V common-mode environments, while the -55 °C to +125 °C military temperature grade supports outdoor and uncontrolled cabinet installations.
Recommended
Multichannel Data Acquisition Systems
For data acquisition front ends digitizing multiple sensors simultaneously, the AD7327TRU-EP-RL7's integrated 8-channel MUX with 1:1 sample-and-hold and 12-bit+sign SAR core provides deterministic per-channel throughput. Software-selectable input ranges let one IC digitize thermocouples at ±50 mV (via external scaling), pressure transducers at ±10 V, and 4-20 mA current-loop shunts all on different channels. The 500 kSPS aggregate rate (62.5 kSPS per channel for full scanning) is more than adequate for vibration, thermal, and process DAQ systems.
Recommended
Defense and Aerospace Signal Conditioning
The -EP suffix designates AQEC-standard qualification with -55 °C to +125 °C operation, controlled manufacturing baseline, one assembly/test site, one fabrication site, enhanced PCN, qualification data on request, and DSCC drawing V62/14636. These attributes satisfy defense and aerospace program requirements for ruggedized multi-channel sensor signal conditioning in avionics, naval, and ground-vehicle platforms. The true bipolar input capability handles MIL-STD-704 or DO-160 power-line sensor signals directly.
Recommended
Motor Control Current and Voltage Monitoring
Three-phase motor drives need simultaneous current and voltage feedback on multiple shunt resistors and bus voltages; the AD7327TRU-EP-RL7's 8 channels and software-selectable ±10 V bipolar input ranges accommodate ±5 V or ±10 V shunt-amplifier outputs and 0-10 V bus dividers with a single IC. The 500 kSPS sample rate is sufficient for sub-10 kHz control-loop bandwidth with 50x oversampling headroom. Software-configurable two's-complement or sign-magnitude output coding simplifies fixed-point DSP math in motor-control firmware.
Recommended
Power Line and Energy Metering
Energy meters digitize voltage and current channels with wide dynamic swings; the AD7327TRU-EP-RL7's ±10 V bipolar input range handles line-voltage resistor-divider outputs directly, while lower ranges (±2.5 V) accommodate current-shunt outputs in the same scan sequence. Per-channel software range selection lets one IC digitize both line voltage (±10 V) and shunt current (±0.25 V with gain) with optimal resolution. The -EP grade supports outdoor meter housings and industrial temperature extremes.
Recommended
Medical Patient Monitoring and Instrumentation
Although not a medical-grade qualified part by default, the AD7327TRU-EP-RL7's wide bipolar input range, 8 channels, and 500 kSPS throughput make it suitable for multi-parameter instrumentation such as patient monitors digitizing ECG, EEG, SpO2, temperature, and respiration channels. Per-channel software-configurable ranges let designers optimize resolution for each sensor type (e.g., ±5 V for ECG, ±2.5 V for temperature) without external PGAs. The wide operating temperature range supports continuous-monitoring bedside equipment.
Recommended
Recommended Products Summary
Engineering reference data for AD7327TRU-EP-RL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7327TRUZ-EP-RL7 | AD7327TRUZ-EP | AD7327BRUZ-REEL7 | AD7327BRUZ | AD7328BRUZ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 20-TSSOP | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same |
| Resolution | 12-bit + sign | 12-bit + sign | 12-bit + sign | 12-bit + sign | 12-bit + sign | 13-bit (no sign) |
| Sampling Rate | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS |
| Number of Channels | 8 | 8 | 8 | 8 | 8 | 8 |
| Temperature Grade | Military -55 °C to +125 °C (-EP) | Military -55 °C to +125 °C (-EP) | Military -55 °C to +125 °C (-EP) | Commercial | Commercial | Commercial |
| Terminal Finish | SnPb (TRU) | Lead-free (Z-suffix) | Lead-free (Z-suffix) | Lead-free | Lead-free | Lead-free |
| Defense/Aerospace Qualification (AQEC) | Yes (-EP) | Yes (-EP) | Yes (-EP) | No | No | No |
| Lifecycle Status | Obsolete | Active | Active | Active | Active | Active |
Key Differentiators
- True bipolar ±10 V input without external signal conditioning (vs AD7327BRUZ-REEL7)
- Software-selectable per-channel input ranges (vs AD7328BRUZ)
- Extended ±12 V input range with external 3 V reference (vs AD7265BCPZ-REEL)
Design Notes
The AD7327-EP requires separate analog and digital supplies (AVCC = +12 V to +16.5 V; DVCC = 2.7 V to 5.25 V) plus a negative analog supply, per the AD7327-EP datasheet. Decouple AVCC and DVCC close to the IC pins with a parallel combination of 10 µF tantalum/ceramic and 0.1 µF ceramic; sequence the analog supply before or simultaneously with the digital supply to prevent CMOS latch-up via parasitic thyristor paths. The negative supply rail must be present before any analog input exceeds its common-mode range.
Use a star-ground topology separating AGND and DGND at the IC, joined at a single point near the ADC. Place the 0.1 µF supply decoupling capacitor within 2 mm of each supply pin and route analog input traces as guard-protected differential pairs to minimize common-mode noise pickup from the digital SPI bus. Keep the REFIN/OUT trace short and surround it with a ground guard ring; if an external reference is used, buffer it close to the pin with a low-noise op-amp.
Do not exceed ±16.5 V on AVCC or ±25 V on any analog input; the device's true bipolar ±10 V/±12 V input ranges assume supplies within their specified limits. Always configure the per-channel input-range register before initiating conversion on that channel; otherwise the channel returns full-scale or zero codes depending on default register state. For external reference operation above 3 V on REFIN/OUT, the analog input range scaling becomes invalid - reference voltages above 3 V are not supported per the AD7327-EP datasheet.
Compliance Information
TRU-suffix indicates SnPb terminal finish (not lead-free); the Z-suffix variants (AD7327TRUZ-EP-RL7) are lead-free RoHS-compliant equivalents. -EP suffix indicates AQEC defense/aerospace qualification with DSCC drawing V62/14636. AEC-Q100 is not applicable (automotive-grade qualification is not targeted by this part).
