ADC122S706CIMTX - Dual 12-bit 1 MSPS Simultaneous-Sampling SAR ADC | Texas Instruments
MPN: ADC122S706CIMTX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.43 | $8.43 |
| 10 | $7.58 | $75.80 |
| 100 | $6.74 | $674.00 |
| 500 | $5.91 | $2,955.00 |
| 1,000 | $5.07 | $5,070.00 |
ADC122S706CIMTX Overview
An SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary-search algorithm against an internal precision DAC to digitize an input voltage in N clock cycles (where N is the resolution in bits). Within the broader converter hierarchy, the SAR architecture sits between flash converters (fastest, lowest resolution) and sigma-delta converters (slowest, highest resolution), offering an attractive speed-to-resolution trade-off with no pipeline latency and excellent DC accuracy. The simultaneous-sampling dual-channel variant specifically targets applications where the relative phase between two channels carries information, such as motor control, power-line monitoring, and multi-axis vibration sensing.
The ADC122S706 operates from a single 2.7 V to 5.5 V analog supply (VA) and a separate 2.7 V to VA digital supply (VD), allowing direct connection to low-voltage DSPs or FPGAs without level translation. The wide external reference range (1.0 V to VA) and true-differential inputs (VIN+ / VIN-) improve common-mode noise rejection in industrial environments. The serial interface operates up to 20 MHz SCLK, and the dual simultaneous data output pins reduce firmware overhead. The 14-pin TSSOP package has a 4.40 mm body width and is rated for the industrial -40°C to +105°C range.
Typical applications include motor current and voltage monitoring in industrial drives, three-phase power-metering front ends, multi-phase power-conversion feedback, vibration analysis for condition-based monitoring, sonar beamforming arrays, and simultaneous temperature/voltage acquisition in instrumentation. The dual simultaneous-sampling inputs directly remove inter-channel phase skew, simplifying downstream DSP.
When designing with this device, place 0.1 µF decoupling capacitors as close as possible to both VA and VD supply pins, use a low-noise low-dropout regulator for VA, and ensure the reference bypass capacitor matches the datasheet recommendation to avoid conversion gain error.
Drop-in alternatives for ADC122S706CIMTX — 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 ADC122S706CIMTX (same form factor and footprint) — differing in Input Type, Package, Architecture, Number of Input Channels, Output Format.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC122S706CIMTX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC122S706CIMT
✅ Drop-In📋 Reference alternative (not in catalog)
ADC122S706CIMT/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC102S101CIMMX/NOPB
✅ Drop-In✓ In Stock
$2.1 / Unit
View Datasheet →ADC122S051CIMMX
✅ Drop-In✓ In Stock
$2.99 / Unit
View Datasheet →ADC122S706CIMTX Maximum Ratings & Electrical Characteristics
| Number of Bits | 12 |
| Sampling Rate | 500 kSPS to 1 MSPS |
| Number of Input Channels | 2 (dual, simultaneous sampling) |
| Input Type | Differential, Single-Ended |
| Architecture | SAR (Successive Approximation Register) |
| Analog Supply Voltage (VA) | 2.7 V to 5.5 V |
| Digital Supply Voltage (VD) | 2.7 V to VA |
| External Reference Range | 1.0 V to VA |
| Integral Non-Linearity (INL) | ±1 LSB (typ) |
| Conversion Time | 0.75 µs (typ) |
| SCLK Frequency Range | 8 MHz to 16 MHz |
| Data Interface | SPI, QSPI, MICROWIRE, DSP serial |
| Data Output Format | Binary two's complement, dual simultaneous serial |
| Operating Temperature Range | -40 °C to +105 °C (industrial) |
| Package | 14-TSSOP (PW), 4.40 mm body width |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
ADC122S706CIMTX Pin Configuration
| Pin 1 | VA — Analog supply voltage (2.7 V to 5.5 V) |
| Pin 2 | VAINA+ — Channel A positive analog input |
| Pin 3 | VAINA- — Channel A negative analog input |
| Pin 4 | VAINB+ — Channel B positive analog input |
| Pin 5 | VAINB- — Channel B negative analog input |
| Pin 6 | REF — External reference input (1.0 V to VA) |
| Pin 7 | GND — Analog ground |
| Pin 8 | CS — Chip select, active low |
| Pin 9 | SCLK — Serial clock input (8 to 16 MHz) |
| Pin 10 | SDOA — Channel A serial data output |
| Pin 11 | SDOB — Channel B serial data output |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | DGND — Digital ground |
| Pin 14 | VD — Digital supply voltage (2.7 V to VA) |
Typical Applications
ADC122S706CIMTX is suitable for 7 applications: Three-Phase Power Metering, Motor Control Current Sensing, Vibration Analysis and Condition Monitoring, Sonar Beamforming Arrays, Industrial Process Control Analog Input Modules, Audio and Ultrasound Dual-Channel Acquisition, Simultaneous Voltage and Current Data Acquisition.
Three-Phase Power Metering
The ADC122S706CIMTX is a natural fit for three-phase power-metering front ends because it offers two fully differential simultaneous-sampling inputs running at 1 MSPS per channel, sufficient bandwidth to resolve harmonics up to the 40th harmonic of a 50/60 Hz fundamental. The wide 1.0 V to VA external reference range accommodates the voltage swings from current transformers or shunt resistors, while the true-differential inputs reject common-mode switching noise from the IGBT bridge. Designers place the ADC on a dedicated analog island with separate VA and VD rails, route a low-drift reference such as the REF5025 to the REF pin, and pair the ADC with a C2000 or MSP430 DSP for active/reactive power calculation.
Recommended
Motor Control Current Sensing
In servo and variable-frequency drive current loops, the ADC122S706CIMTX samples two motor phase currents simultaneously so the controller can reconstruct the third phase without timing skew. The 0.75 µs typical conversion time and 1 MSPS throughput comfortably support FOC (field-oriented control) update rates above 20 kHz with safety margin. Differential inputs isolate the ADC from the high-dv/dt common-mode noise of the inverter, and the 2.7 V to 5.5 V analog supply lets the ADC share the +5 V rail with the gate-driver housekeeping logic.
Recommended
Vibration Analysis and Condition Monitoring
Multi-axis vibration analysis requires capturing two or more accelerometer channels with known phase relationship; the ADC122S706CIMTX delivers exactly that with its dual simultaneous-sampling differential inputs at 12-bit precision. At 1 MSPS per channel, the converter supports vibration analysis on rotating machinery up to 25 kHz of mechanical bandwidth (with appropriate anti-alias filter). The serial SPI/QSPI output streams data directly to an FPGA or DSP for envelope analysis, FFT, and bearing-fault detection algorithms in IIoT condition-monitoring systems.
Recommended
Sonar Beamforming Arrays
Hydrophone arrays in sonar beamforming systems require sampling multiple channels simultaneously so the relative phase between elements is preserved for beam-steering calculations. The ADC122S706CIMTX provides two channels of 12-bit, 1 MSPS simultaneous sampling per chip, allowing cascaded chips to build 4-, 6-, or 8-element arrays with deterministic inter-channel phase. Differential inputs reject the common-mode pickup inherent in long towed-array cables, and the industrial -40 °C to +105 °C temperature range supports marine and outdoor enclosures.
Recommended
Industrial Process Control Analog Input Modules
Analog input modules for industrial PLC and DCS systems need to digitize 4-20 mA or voltage signals from multiple sensors with high noise immunity. The ADC122S706CIMTX supports two simultaneously-sampled differential inputs with 1 MSPS throughput, easily handling multiplexed thermocouple, RTD, or strain-gauge bridges. The 14-pin TSSOP package drops onto standard PLC analog-front-end daughterboards, and the SPI-compatible serial interface integrates with backplane isolators such as the ISO7741 for galvanic isolation to the fieldbus controller.
Recommended
Audio and Ultrasound Dual-Channel Acquisition
Professional audio and ultrasound front ends often digitize signals from paired microphones or transducers where inter-channel phase coherence is critical. The ADC122S706CIMTX delivers two channels at 1 MSPS simultaneously, well above the Nyquist rate for 20 kHz audio or 200 kHz ultrasound bands, with 12-bit resolution suitable for downstream digital gain, mixing, and beamforming. Differential inputs reject ground-loop noise in studio installations where long balanced cables are common.
Recommended
Simultaneous Voltage and Current Data Acquisition
Bench-top and production test equipment must digitize voltage and current waveforms simultaneously to characterize power-supply efficiency, inrush, and dynamic response. The ADC122S706CIMTX samples both channels at exactly the same instant, eliminating timing skew between V and I that would otherwise cause apparent phase error in computed power. The 1 MSPS rate captures fast switching transitions in SMPS devices, and the serial output streams to a microcontroller or FPGA for real-time P = V × I calculation.
Recommended
Recommended Products Summary
Engineering reference data for ADC122S706CIMTX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC122S706CIMTX/NOPB | ADC122S706CIMT | ADC122S706CIMT/NOPB | ADC102S101CIMMX/NOPB | ADC122S051CIMMX |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-TSSOP (PW) | 14-TSSOP (PW) - same | 14-TSSOP (PW) - same | 14-TSSOP (PW) - same | 10-MSOP - different | 10-MSOP - different |
| Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 10-bit | 12-bit |
| Sample Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 500 kSPS |
| Channel Count / Sampling | — | 2 simultaneous | 2 simultaneous | 2 simultaneous | 1 single-ended | 2 sequential |
| Input Type | Differential / Single-Ended | Differential / Single-Ended | Differential / Single-Ended | Differential / Single-Ended | Single-Ended | Single-Ended |
| Analog Supply (VA) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Interface | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
| Operating Temperature | -40 °C to +105 °C | -40 °C to +105 °C | -40 °C to +105 °C | -40 °C to +105 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Key Differentiators
- Dual simultaneous-sampling inputs at 1 MSPS per channel (vs ADC122S051CIMMX)
- True differential analog inputs for high common-mode rejection (vs ADC102S101CIMMX/NOPB)
- Industrial -40 °C to +105 °C temperature range (vs ADC122S051CIMMX)
Design Notes
Use separate analog (VA) and digital (VD) supply rails for the ADC122S706CIMTX, even if they originate from the same 3.3 V or 5 V source. Place a ferrite bead or small L-C filter between the rails and a local 0.1 µF + 10 µF decoupling pair on each pin. The analog reference is the most noise-sensitive net; route VA and the REF bypass capacitor before any digital signals on the PCB, and use a star-ground topology with VA and DGND meeting only at the ADC GND pin.
Place the ADC122S706CIMTX in a quiet analog island away from switching converters, gate drivers, and digital high-speed traces. Keep analog input traces (VAINA+/-, VAINB+/-) differential and length-matched, with a ground guard trace or coplanar waveguide structure to reject common-mode noise from digital signals. Place the REF bypass capacitor (typically 10 µF ceramic in parallel with 0.1 µF) within 5 mm of the REF pin to avoid conversion-gain error and reference-induced noise on the conversion result.
Do not leave any analog input of the ADC122S706CIMTX floating, because both inputs of each channel must be biased within the common-mode range of VA (typically 0 V to VA). Tie unused inputs to mid-rail (VA/2) through a buffer, or short them together to a known voltage. Driving inputs above VA or below GND, even briefly, can cause permanent damage or latch-up. Also ensure CS, CS (chip select) is pulled high between conversions if not actively controlled by the host, to avoid spurious conversions and digital-supply current spikes.
The serial SCLK, SDOA, and SDOB signals of the ADC122S706CIMTX can radiate noise back into the analog inputs if not isolated. Place a 33 Ω series-termination resistor at each SCLK and SDO output when routing longer than 25 mm or to an FPGA across the board. Keep SCLK below 16 MHz and avoid running the SPI bus parallel to the analog input traces on adjacent layers without a continuous ground plane in between.
Compliance Information
RoHS-compliant per TI product page. The /NOPB suffix variant guarantees lead-free finish. Not AEC-Q100 qualified - this part is intended for industrial instrumentation, not automotive under-hood use.
