ADS7806PBG4 - 12-Bit 40kSPS SAR ADC, 28-PDIP | Texas Instruments
MPN: ADS7806PBG4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.92 | $89.20 |
| 100 | $7.55 | $755.00 |
| 500 | $6.2 | $3,100.00 |
| 1,000 | $5.1 | $5,100.00 |
ADS7806PBG4 Overview
Key specifications include maximum +/-1/2 LSB integral and differential nonlinearity, 72 dB minimum SINAD at 1 kHz input, and 35 mW maximum power dissipation with a 50 uW power-down mode. The architecture is CMOS SAR with internal or external reference, ensuring compatibility with bipolar industrial signals while operating from a unipolar 5V rail via front-end scaling.
Typical applications include industrial process control data acquisition, multi-channel PLC analog input modules, portable instrumentation with battery power management, and precision sensor signal conditioning. The wide +/-10V input range also supports legacy transducer signal chains without external amplification.
When designing with this device, ensure the analog input is properly buffered to avoid driving the switched-capacitor input directly. Decouple VDD with 10 uF + 0.1 uF capacitors placed within 5 mm of the supply pins.
Drop-in alternatives for ADS7806PBG4 — 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 ADS7806PBG4 (same form factor and footprint) — differing in Operating Temperature, Sampling Rate, Data Interface, Input Voltage Range, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS7807
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7805PB
✅ Drop-In✓ In Stock
$10.95 / Unit
View Datasheet →ADS7813PG4
✅ Drop-In✓ In Stock
$18.75 / Unit
View Datasheet →ADS7800KPG4
✅ Drop-In✓ In Stock
$16.2 / Unit
View Datasheet →ADS7805PG4
✅ Drop-In✓ In Stock
$17.9 / Unit
View Datasheet →ADS7825U/1K
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7806PBG4 Maximum Ratings & Electrical Characteristics
| Number of Bits | 12 |
| Sampling Rate | 40 kSPS |
| Input Channels | 1 |
| Architecture | SAR |
| Data Interface | Serial, Parallel |
| Input Voltage Range | +/-10 V, 0 V to +5 V, 0 V to +4 V |
| Supply Voltage | 5 V single |
| Power Dissipation | 35 mW max |
| Power-Down Current | 50 uW |
| INL (Max) | +/-1/2 LSB |
| SINAD | 72 dB min at 1 kHz input |
| Acquisition + Conversion Time | 25 us max |
| Reference | Internal or External |
| Operating Temperature | -40C to +85C |
| Package | 28-PDIP (0.300 inch / 7.62 mm) |
| Mounting Type | Through-Hole |
| RoHS Status | Compliant |
ADS7806PBG4 Pin Configuration
| Pin 1 | VDD — +5V analog supply |
| Pin 2 | AGND — Analog ground |
| Pin 3 | REF OUT — Internal reference output |
| Pin 4 | REF IN — Reference input (external ref option) |
| Pin 5 | AIN — Analog input |
| Pin 6 | R1 — Range select bit 1 |
| Pin 7 | R2 — Range select bit 0 |
| Pin 8 | CS — Chip select (active low) |
| Pin 9 | RD — Read strobe (active low) |
| Pin 10 | WR — Write / convert start (active low) |
| Pin 11 | BUSY — Conversion in progress flag |
| Pin 12 | SER — Serial/Parallel mode select |
| Pin 13 | CLK — Serial clock input |
| Pin 14 | DB0/SEROUT — Data bit 0 / Serial data out |
| Pin 15 | DB1 — Data bit 1 |
| Pin 16 | DB2 — Data bit 2 |
| Pin 17 | DB3 — Data bit 3 |
| Pin 18 | DB4 — Data bit 4 |
| Pin 19 | DB5 — Data bit 5 |
| Pin 20 | DB6 — Data bit 6 |
| Pin 21 | DB7 — Data bit 7 |
| Pin 22 | DB8 — Data bit 8 |
| Pin 23 | DB9 — Data bit 9 |
| Pin 24 | DB10 — Data bit 10 |
| Pin 25 | DB11/MSB — Data bit 11 (MSB) |
| Pin 26 | TAG — Input polarity / tag bit |
| Pin 27 | DGND — Digital ground |
| Pin 28 | VLOG — Logic supply (5V) |
Typical Applications
ADS7806PBG4 is suitable for 6 applications: Industrial Process Control DAQ, Portable Instrumentation with Battery Power, Multi-Channel PLC Analog Input Modules, Precision Sensor Signal Conditioning, Data Acquisition Systems, Audio-Bandwidth Measurement.
Industrial Process Control DAQ
The ADS7806PBG4 fits industrial process-control data-acquisition front ends because of its software-selectable +/-10 V / 0-5 V / 0-4 V input ranges, which allow direct connection to legacy +/-10 V transducer outputs and 4-20 mA shunts without external signal conditioning. According to TI's datasheet, the 72 dB SINAD and +/-1/2 LSB INL are sufficient for PLC-grade accuracy on temperature, pressure, and flow channels. Its 5V single-supply operation simplifies PLC analog-module design versus bipolar designs. The 28-DIP through-hole package suits chassis-mount screw-terminal assemblies common in process-control cabinets. Designers should place 10 uF + 0.1 uF VDD decoupling within 5 mm and buffer the analog input against switching transients.
Recommended
Portable Instrumentation with Battery Power
The ADS7806PBG4 is well suited to battery-powered portable instruments because of its 50 uW power-down mode and 35 mW active dissipation. According to the TI datasheet, cycling the ADC into power-down between conversions can reduce effective system current draw by 10-100x compared to continuous operation, extending battery life for hand-held multimeters and field data loggers. The 5V single-supply operation simplifies USB- or 4xAA-powered designs. Its 28-DIP package allows hand-solderable prototyping on perf-board. Design tip: gate the power-down pin with the host MCU's sample-rate timer to coordinate wake/sleep cycles.
Recommended
Multi-Channel PLC Analog Input Modules
The ADS7806PBG4's parallel interface and 40 kSPS sampling rate suit multiplexed multi-channel PLC analog input modules. According to TI's datasheet, the SAR architecture's 25 us conversion time lets one ADC serve 8-16 channels via an external analog mux at typical PLC update rates of 100-1000 Hz per channel. The DIP-28 through-hole package resists industrial vibration better than fine-pitch SOIC, important in factory-floor environments. Wide +/-10 V input range handles industrial sensors directly without scaling. Use opto-isolated digital interfaces to maintain galvanic isolation between field and logic grounds.
Recommended
Precision Sensor Signal Conditioning
The ADS7806PBG4's 12-bit resolution (1 LSB = 2.4 mV at +/-10 V) suits bridge sensors, thermocouples, and LVDT position sensors in mid-tier precision applications. According to TI's datasheet, the 72 dB SINAD and internal reference provide enough accuracy for sensor temperature-compensation and linearity correction in industrial weighing scales and torque sensors. Single 5V supply operation reduces BOM versus bipolar ADCs. The DIP-28 package suits retrofit and legacy replacement designs. Pair with chopper op-amps for low-drift sensor amplification.
Recommended
Data Acquisition Systems
The ADS7806PBG4 fits standalone data-acquisition cards for industrial PCs and embedded test equipment. According to TI's datasheet, its parallel 12-bit bus interface drops cleanly into PC/104, FPGA, and DSP buses without glue logic, while its serial mode can connect to MCUs with minimal pin usage. The 5V single supply suits legacy backplanes. Maximum sampling rate of 40 kSPS is sufficient for audio-bandwidth data logging and vibration analysis. Designers should add input protection diodes when connecting to external test fixtures.
Recommended
Audio-Bandwidth Measurement
The ADS7806PBG4 fits audio-bandwidth measurement equipment where its 40 kSPS sampling rate provides adequate Nyquist bandwidth for 20 kHz audio measurements. According to TI's datasheet, the 72 dB SINAD is sufficient for instrumentation-quality audio test gear such as audio analyzers and loudspeaker test jigs. Wide input ranges including +/-10 V allow direct measurement of balanced audio line levels without external attenuators. Single 5V supply simplifies USB-powered test gear.
Recommended
Recommended Products Summary
Engineering reference data for ADS7806PBG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS7807 | ADS7805PB | ADS7813PG4 | ADS7800KPG4 |
|---|---|---|---|---|---|
| Package | 28-PDIP (through-hole) | 28-PDIP (through-hole) - same | 28-PDIP (through-hole) - same | 28-PDIP (through-hole) - same | 28-DIP (through-hole) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Architecture | SAR | SAR | SAR | SAR | SAR |
| Supply Voltage | 5V single | 5V single | 5V single | 5V single | 5V single |
| Pin Compatibility | 28-PDIP baseline | Pin-compatible 16-bit upgrade | Pin-compatible 12-bit variant | 28-DIP through-hole | 28-DIP family member |
Key Differentiators
- Three software-selectable input ranges in one device (vs ADS7805PB)
- 40 kSPS sampling rate with internal reference (vs ADS7800KPG4)
- 50 uW power-down mode for battery use (vs ADS7813PG4)
Design Notes
Place a 10 uF tantalum or ceramic bypass capacitor as close as possible to the VDD pin (pin 1) plus a 0.1 uF ceramic in parallel to filter high-frequency noise. According to TI's datasheet, single 5V supply operation requires solid decoupling to maintain rated 72 dB SINAD. For battery-powered designs, route the PWRDN pin to a host MCU GPIO to gate ADC activity between conversions.
Keep analog and digital grounds separated; tie them together at a single point near the AGND pin (pin 2). According to SAR ADC best practice, routed switching transients from the digital bus return currents can couple into the analog front end and degrade SINAD by 3-5 dB if grounds are not properly partitioned. Place the data bus traces away from the AIN and REF traces.
Drive the analog input (pin 5) through a low-impedance op-amp buffer; the ADS7806PBG4's switched-capacitor input draws transient current spikes during acquisition. According to TI's datasheet, an input buffer with bandwidth at least 10x the maximum sample rate preserves the rated THD and SINAD. For +/-10V input range, verify that the chosen op-amp supports the full input range to within the common-mode limit.
Estimated: when using the internal reference, REF OUT (pin 3) should be decoupled with 10 uF + 0.1 uF; bypassing both reduces reference noise by an order of magnitude and improves overall accuracy. Never short REF IN to REF OUT externally; doing so may damage the internal reference buffer.
Compliance Information
RoHS compliant per manufacturer product page; through-hole DIP packaging supports legacy and industrial retrofit designs. Not automotive AEC-Q100 qualified.
