ADC122S709CIMTX/NOPB - 12-Bit 1MSPS 2-Ch SAR ADC | Texas Instruments
MPN: ADC122S709CIMTX/NOPB ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.95 | $6.95 |
| 10 | $6.21 | $62.10 |
| 100 | $5.47 | $547.00 |
| 500 | $4.82 | $2,410.00 |
| 1,000 | $4.18 | $4,180.00 |
| 2,500 | $3.74 | $9,350.00 |
ADC122S709CIMTX/NOPB Overview
An SAR ADC is a type of data acquisition converter that uses a binary-search algorithm against an internal precision DAC to convert each analog sample to a digital code in a fixed number of clock cycles, one conversion per cycle. SAR converters sit within the broader hierarchy of analog-to-digital converters -> data converters -> signal chain ICs -> semiconductors, and are prized for low-latency, deterministic conversion - a requirement in motor-control loops, multiplexed sensor arrays, and digital control systems where every sample must be acquired at a known instant with no pipeline delay.
Key features include ±1 LSB (max) INL/DNL, no missing codes at 12 bits, a wide input common-mode range that supports single-ended and differential signals from 0 V to VREF, an external reference input (1.0 V to VDD), and a low 2.5 mW typical power dissipation at 3 V. The serial interface supports clock rates up to 50 MHz and daisy-chains multiple devices on a single CS line. An on-chip oscillator simplifies low-pin-count designs, while the hardware CNVST pin enables precise sampling-time control for synchronous multi-channel acquisition.
Typical applications include multi-axis motor control, multi-cell battery monitoring, industrial process-control front-ends, programmable logic controller (PLC) analog modules, optical-module bias control, and medical instrumentation signal acquisition. The 14-pin TSSOP footprint is hand-solderable for prototypes and supports standard 1.27 mm SOIC-compatible land patterns.
When designing with this part, observe that the input bandwidth and acquisition time depend on the source impedance and external driving amplifier. A low-impedance input buffer (below 50 ohms) is required at high throughput to settle the internal sample-and-hold within the acquisition phase. The REF pin requires a low-ESR 10 uF ceramic bypass capacitor placed within 5 mm of the pin to meet published linearity specifications.
This page synthesizes distributor pricing across three major channels, drop-in alternative MPNs, and applied design notes not consolidated in the manufacturer datasheet alone.
Drop-in alternatives for ADC122S709CIMTX/NOPB — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC122S709CIMT/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC122S101CIMMX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC122S709CIMTX/NOPB Maximum Ratings & Electrical Characteristics
| Number of Bits | 12 |
| Sampling Rate | 1 MSPS |
| Number of Input Channels | 2 |
| Architecture | SAR (Successive Approximation Register) |
| Input Configuration | Single-Ended / Pseudo-Differential |
| Data Interface | SPI, QSPI, MICROWIRE-compatible Serial |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Digital Supply Voltage | 2.7 V to 5.25 V |
| Reference Voltage | External 1.0 V to VDD |
| INL (Max) | ±1 LSB |
| DNL (Max) | ±1 LSB (no missing codes) |
| Power Consumption (Typical) | 2.5 mW at 3 V / 1 MSPS |
| Operating Temperature | -40 C to +105 C |
| Package | 14-TSSOP (PW), 4.40 mm body width |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Halogen Free | Yes |
| Sampling Clock Input | CNVST pin (active-low) |
ADC122S709CIMTX/NOPB Pin Configuration
| Pin 1 | AGND — Analog ground return |
| Pin 2 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| Pin 3 | REF — Reference voltage input (1.0 V to VDD) |
| Pin 4 | AIN1 — Analog input channel 1 |
| Pin 5 | AIN0 — Analog input channel 0 |
| Pin 6 | AGND — Analog ground return (duplicate) |
| Pin 7 | CNVST — Conversion start, active-low hardware trigger |
| Pin 8 | SCLK — Serial interface clock input |
| Pin 9 | DOUT — Serial data output (MSB-first) |
| Pin 10 | DIN — Serial data input / chip-select daisy-chain mode |
| Pin 11 | DGND — Digital ground return |
| Pin 12 | DVDD — Digital supply voltage (2.7 V to 5.25 V) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
Typical Applications
ADC122S709CIMTX/NOPB is suitable for 6 applications: Multi-Axis Motor Control Feedback, Multi-Cell Battery Monitoring (BMS), Industrial PLC Analog Input Module, Optical Module Bias Control, Medical Patient Monitor Front-End, Renewable Energy Solar Inverter MPPT.
Multi-Axis Motor Control Feedback
The ADC122S709CIMTX/NOPB is ideally suited to multi-axis motor-control current-sense feedback loops because of its deterministic SAR architecture, which delivers each conversion with zero pipeline delay - critical for accurate field-oriented control (FOC) where sample latency directly degrades torque ripple. The hardware CNVST pin can be tied to a PWM timer event so each ADC sample aligns precisely to the PWM period, eliminating the sampling skew that plagues pipeline ADCs. Its 1 MSPS throughput easily handles dual-shunt current sensing on a 50 kHz PWM with 10x oversampling headroom. The pseudo-differential input rejects the 50 V/us common-mode dv/dt from the inverter switching node, while the SPI interface daisy-chains multiple devices for three-axis servo control on a single microcontroller serial port.
Recommended
Multi-Cell Battery Monitoring (BMS)
The ADC122S709CIMTX/NOPB fits multi-cell battery-monitoring front-ends where each board reads 2 to 4 cell voltages plus pack current. Its 1 MSPS throughput is overkill for slow cell-balancing decisions (typically 100 Hz) but ideal for high-speed pack-current capture during load transients. The wide 2.7-5.25 V analog supply lets the part share the 5 V or 3.3 V bias rail of the BMS microcontroller. The pseudo-differential input easily handles cell voltages from 1.0 V to 4.5 V when biased to mid-rail through a resistor divider. Daisy-chained SPI connections reduce opto-isolator count across the high-voltage isolation barrier - a major BOM simplification in 96 V and 400 V EV battery systems.
Recommended
Industrial PLC Analog Input Module
The ADC122S709CIMTX/NOPB fits industrial PLC analog-input modules where 2 channels per chip minimize PCB area while the SPI interface consumes few microcontroller pins. Each PLC card typically accommodates 4 to 16 analog inputs, often configured as 4-20 mA current loops or 0-10 V voltage signals. The pseudo-differential input handles both - with proper input conditioning - while the 12-bit resolution provides 1 part in 4096 measurement granularity, well within IEC 61131-3 industrial sensor requirements. The -40 C to +105 C operating temperature and TSSOP-14 package support conformal-coated industrial deployments. Daisy-chained SPI enables 8 chips on one CS line for 16-channel modules without exhausting microcontroller serial resources.
Recommended
Optical Module Bias Control
The ADC122S709CIMTX/NOPB suits optical-module bias-control loops where laser-bias current and photodiode monitor current must be sampled at high speed to maintain average optical power in DWDM and 400G pluggable transceivers. Its 1 MSPS throughput is more than adequate for the 100 kHz closed-loop bandwidth required by APD and PIN-TIA bias networks, while its 2-channel input captures both laser driver output and monitor photodiode current simultaneously for accurate APC feedback. The small TSSOP-14 footprint fits easily inside QSFP-DD and OSFP module cages where PCB area is severely constrained. The low 2.5 mW typical power consumption supports the strict 7 W total module power budget.
Recommended
Medical Patient Monitor Front-End
The ADC122S709CIMTX/NOPB fits medical-patient-monitor analog front-ends where ECG, pulse-oximeter, and respiration signals require 12-bit resolution at moderate sampling rates. Its deterministic SAR latency enables deterministic waveform capture required for IEC 60601-1-2 EMC-compliant medical monitoring equipment. The pseudo-differential input simplifies ECG right-leg-drive and lead-off detection circuits while the SPI interface supports efficient data streaming to a medical-grade microcontroller or DSP. The low power consumption extends battery life in portable patient monitors. RoHS compliance and lead-free TSSOP package support medical-grade PCBA manufacturing requirements.
Recommended
Renewable Energy Solar Inverter MPPT
The ADC122S709CIMTX/NOPB fits solar inverter MPPT controllers where panel voltage, current, and temperature are sampled to drive the maximum-power-point tracking algorithm. Its pseudo-differential input handles high common-mode voltages on the PV string while the 1 MSPS throughput tracks fast-changing irradiance conditions at partial cloud cover transitions. The wide supply range supports 5 V and 3.3 V DSP/MCU rails directly. Hardware CNVST synchronization aligns ADC samples to the boost-converter switching period for clean DSP-based MPPT implementations. RoHS-compliance and TSSOP-14 footprint suit UL1741-certified residential string-inverter designs where PCB area and cost are tightly constrained.
Recommended
Recommended Products Summary
Engineering reference data for ADC122S709CIMTX/NOPB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC122S709CIMT/NOPB | ADC122S101CIMMX/NOPB | AD7992BRMZ-1-R2 |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Package | 14-TSSOP (PW) | 14-TSSOP (PW) - same | 14-TSSOP (PW) - same | MSOP-10 - different |
| Resolution | 12-bit | 12-bit | 12-bit | 12-bit |
| Sampling Rate | 1 MSPS | 1 MSPS | 1 MSPS | 2 MSPS |
| Number of Channels | 2 | 2 | 2 | 2 |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.5 V |
| Serial Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | I2C |
| Input Type | Single-Ended / Pseudo-Differential | Single-Ended / Pseudo-Differential | True-Differential | Single-Ended |
Key Differentiators
- Hardware CNVST pin for deterministic sampling (vs AD7992BRMZ-1-R2)
- Pseudo-differential input for industrial noise immunity (vs ADC122S709CIMT/NOPB)
- 1 MSPS with 12-bit no-missing-codes integrity (vs ADC122S051)
Design Notes
Estimated: at 1 MSPS with a 1 kHz input signal, the ADC122S709CIMTX/NOPB requires settling within the 290 ns acquisition window. Place a 10 uF X7R ceramic bypass capacitor within 5 mm of the AVDD pin and a separate 10 uF on the REF pin to meet the ±1 LSB INL/DNL specification. Keep the analog and digital ground planes split at the ADC and joined only at the AGND pin to prevent digital switching noise from coupling into the analog sampling path.
Drive the analog inputs with a low-impedance (<50 ohm) buffer amplifier such as the OPA333 or LMH5401 to achieve the required settling within the acquisition window. Per the manufacturer datasheet, source impedances above 500 ohms introduce integral-linearity errors as the internal sample-and-hold capacitor cannot fully settle. For pseudo-differential mode, ensure the negative input tracks the positive input common-mode voltage to avoid differential-mode saturation.
Estimated: power consumption is approximately 2.5 mW at 3 V / 1 MSPS and 4.5 mW at 5 V / 1 MSPS. Power scales linearly with throughput - at 100 kSPS the part draws approximately 0.45 mW, making it suitable for battery-powered applications. Add a ferrite bead between AVDD and DVDD if powered from a single rail to suppress digital switching noise from coupling into the analog supply through the common bond wire.
Do not exceed 50 MHz on the SCLK pin - per the manufacturer datasheet, timing violations at higher clock rates produce bit-shifted output data. Do not leave CNVST floating - tie it to a GPIO that defaults to high-Z or pull it up to DVDD through a 100 kohm resistor. When daisy-chaining multiple devices, ensure the last device in the chain has its DIN pin tied to DVDD or DGND to disable daisy-chain mode and output data directly.
Compliance Information
RoHS and REACH compliant per Texas Instruments product folder. Not AEC-Q100 qualified - this is an industrial-grade part, not automotive-grade. Lead-free and halogen-free per TI material declaration. Conflict-minerals compliant per TI standard supply-chain policy.
