ADS7824UB/1KG4 - 12-Bit 4-Ch 40kSPS SAR ADC | Texas Instruments
MPN: ADS7824UB/1KG4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $15.2 | $15.20 |
| 10 | $13.8 | $138.00 |
| 100 | $12.1 | $1,210.00 |
| 500 | $10.65 | $5,325.00 |
| 1,000 | $9.4 | $9,400.00 |
ADS7824UB/1KG4 Overview
A SAR ADC is a type of data converter that uses a binary-search successive-approximation algorithm against an internal DAC to determine each code. SAR converters sit within the broader hierarchy of analog-to-digital converters (ADC) -> data converters -> signal chain ICs -> mixed-signal semiconductors, and are valued for deterministic latency, no pipeline delay, and excellent DC linearity — making them well suited to multiplexed multi-channel data acquisition systems where the application needs accurate snapshots of slowly varying analog signals.
Key features of the ADS7824UB/1KG4 include a 4-channel input multiplexer, an on-chip sample-and-hold amplifier, internal clock, an internal 2.5 V reference, and both parallel and serial microprocessor-compatible data outputs. The converter supports an external reference option, provides unipolar/bipolar input ranges, and is pin-compatible with the 16-bit ADS7825, allowing a single PCB to serve both 12-bit and 16-bit product variants. Maximum integral nonlinearity (INL) and differential nonlinearity (DNL) are specified at ±0.5 LSB each.
Architecturally, the ADS7824 uses a charge-redistribution DAC array with thin-film laser-trimmed input scaling resistors, which simultaneously provides the bipolar ±10 V input range and excellent channel-to-channel matching. The internal reference can be overdriven externally for ratio-metric applications, and the SAR core is monotonic by design.
Typical applications include industrial process control, multi-channel data acquisition systems, portable instrumentation, and automated test equipment. The wide ±10 V input range and four-channel mux make it ideal for direct connection to industrial sensors and transducer bridges without external signal conditioning. When designing with this device, ensure the input signal does not exceed ±15 V absolute maximum, and add 100 Ω series resistors with 1 nF capacitors on analog inputs to protect against transients while preserving the 25 µs acquisition time.
Drop-in alternatives for ADS7824UB/1KG4 — 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 ADS7824UB/1KG4 (same form factor and footprint) — differing in Resolution, Number of Input Channels, Package, Architecture, Data Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS7824UB/1K
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7824UB
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7824UE4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7825UBE4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7825UBG4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7824U
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7824UB/1KG4 Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Number of Input Channels | 4 |
| Converter Type | SAR (Successive Approximation Register) |
| Sampling Rate | 40 kSPS max |
| Acquisition + Conversion Time | 25 µs max |
| Supply Voltage | Single +5 V |
| Power Dissipation | 50 mW max |
| Power Dissipation (Power-Down) | 50 µW |
| Input Voltage Range | ±10 V (industrial standard) |
| Channel-to-Channel Matching | ±0.1% |
| Integral Nonlinearity (INL) | ±0.5 LSB max |
| Differential Nonlinearity (DNL) | ±0.5 LSB max |
| Data Output Interface | Parallel and Serial (microprocessor-compatible) |
| Internal Reference | 2.5 V (external reference option) |
| Operating Temperature Range | -40°C to +85°C |
| Package | 28-pin SOIC (DW), wide body |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Pin-Compatible Family Member | ADS7825 (16-bit version, same pinout) |
ADS7824UB/1KG4 Pin Configuration
| Pin 1 | VREF — Reference voltage input/output (internal 2.5 V) |
| Pin 2 | CH0 — Analog input channel 0 (±10 V range) |
| Pin 3 | CH1 — Analog input channel 1 (±10 V range) |
| Pin 4 | CH2 — Analog input channel 2 (±10 V range) |
| Pin 5 | CH3 — Analog input channel 3 (±10 V range) |
| Pin 6 | AGND — Analog ground |
| Pin 7 | DGND — Digital ground |
| Pin 8 | VBD — Buffer digital supply |
| Pin 9 | R/C — Read/Convert input |
| Pin 10 | CS — Chip select (active low) |
| Pin 11 | BUSY — Conversion in progress (active high) |
| Pin 12 | DB11 — Data bit 11 (MSB) |
| Pin 13 | DB10 — Data bit 10 |
| Pin 14 | DB9 — Data bit 9 |
| Pin 15 | DB8 — Data bit 8 |
| Pin 16 | DB7 — Data bit 7 |
| Pin 17 | DB6 — Data bit 6 |
| Pin 18 | DB5 — Data bit 5 |
| Pin 19 | DB4 — Data bit 4 |
| Pin 20 | DB3 — Data bit 3 |
| Pin 21 | DB2 — Data bit 2 |
| Pin 22 | DB1 — Data bit 1 |
| Pin 23 | DB0 — Data bit 0 (LSB) |
| Pin 24 | SDATA — Serial data output |
| Pin 25 | SCLK — Serial data clock |
| Pin 26 | SYNC — Synchronization input for serial interface |
| Pin 27 | PWRD — Power-down input (active low) |
| Pin 28 | VDD — +5 V analog supply |
Typical Applications
ADS7824UB/1KG4 is suitable for 6 applications: Industrial Process Control, Multi-Channel Data Acquisition Systems, Portable Instrumentation, Automated Test Equipment (ATE), Medical Patient Monitoring, Power Line Monitoring and Energy Metering.
Industrial Process Control
The ADS7824UB/1KG4 is a strong fit for industrial process control because its on-chip 4-channel input multiplexer and laser-trimmed ±10 V scaling resistors accept standard industrial sensor outputs directly, eliminating the need for external signal conditioning. With ±0.1% channel-to-channel matching, four independent transducer channels can be read sequentially by a single ADC without recalibration between scans. The 40 kSPS throughput comfortably handles multiplexed temperature, pressure, and flow loops in PLC and DCS systems, while the 50 mW dissipation keeps backplane thermal budgets modest. Compared with a discrete ADC plus external mux, the integrated approach reduces BOM cost and PCB area. The 28-pin SOIC (DW) wide-body package is a familiar industrial form factor.
Recommended
Multi-Channel Data Acquisition Systems
Multi-channel data acquisition cards benefit from the ADS7824UB/1KG4's combination of four true-differential input channels, integrated sample-and-hold, and a parallel/serial microprocessor interface. The 25 µs acquisition-plus-conversion time supports aggregate scan rates up to 40 kSPS aggregate, with deterministic SAR latency that simplifies host firmware timing. The 12-bit dynamic range is well-matched to 4-20 mA and 0-10 V industrial transducer loops. The /1KG4 tape-and-reel packaging supports high-volume automated assembly on acquisition card production lines. For applications requiring synchronized sampling, multiple ADS7824UB/1KG4 parts can share a common start-of-conversion signal.
Recommended
Portable Instrumentation
Battery-powered portable instruments benefit from the ADS7824UB/1KG4's 50 mW active dissipation and 50 µW power-down dissipation, which together enable a low average power budget when conversions are duty-cycled. The single +5 V supply rail matches common battery-derived system voltages in handheld meters, and the 4-channel mux allows a single ADC to serve multiple sensor inputs. The wide ±10 V input range is convenient for diagnostic equipment that interfaces with industrial-grade signals. Power-down mode between conversions can extend battery life by an order of magnitude in low-duty-cycle applications such as handheld multimeters and field data loggers.
Recommended
Automated Test Equipment (ATE)
Automated test equipment pin-electronics and instrument backplanes use the ADS7824UB/1KG4 for its deterministic 25 µs conversion time, ±0.5 LSB INL/DNL linearity, and parallel/serial interface flexibility. The 4-channel input mux allows a single ADC to sequentially digitize multiple test points per DUT, reducing per-channel instrumentation cost in high-channel-count ATE racks. The 12-bit resolution is sufficient for parametric test thresholds and many measurement instruments. The wide industrial ±10 V input range accepts direct connection to standard test fixture signal levels without external scaling, simplifying fixture design and calibration.
Recommended
Medical Patient Monitoring
Patient monitoring equipment such as multi-parameter bedside monitors uses the ADS7824UB/1KG4 to digitize multiple vital-sign channels (ECG, SpO2, respiration, temperature) with a single ADC. The 4-channel input mux and ±0.1% channel-to-channel matching ensure consistent gain across vital-sign channels, which is critical for alarm thresholds and trend analysis. The 12-bit resolution is appropriate for vital-sign waveforms where dynamic range requirements are modest. The 50 mW dissipation and 50 µW power-down mode support IEC 60601-1 power budget compliance for portable and wearable patient monitors.
Recommended
Power Line Monitoring and Energy Metering
Three-phase energy meters and power quality monitors use the ADS7824UB/1KG4 to digitize voltage and current channels simultaneously through its 4-channel input mux (two voltage + two current, or three-phase voltage + neutral). The ±10 V input range accepts the output of standard voltage dividers and current shunts or CTs without external signal conditioning. The 12-bit resolution supports Class 1 metering accuracy requirements, and the 40 kSPS sampling rate is sufficient for 50/60 Hz fundamental and harmonic analysis up to several kHz. The 50 mW dissipation is well within the thermal budget of sealed meter enclosures.
Recommended
Recommended Products Summary
Engineering reference data for ADS7824UB/1KG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS7824UB/1K | ADS7824UB | ADS7824UE4 | ADS7825UBE4 | ADS7825UBG4 | ADS7824U |
|---|---|---|---|---|---|---|---|
| Package | 28-pin SOIC (DW) | 28-pin SOIC (DW) - same | 28-pin SOIC (DW) - same | 28-pin SOIC (DW) - same | 28-pin SOIC (DW) - same | 28-pin SOIC (DW) - same | 28-pin SOIC (DW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 16 bits | 16 bits | 12 bits |
| Sampling Rate | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS |
| Input Channels | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Input Voltage Range | ±10 V | ±10 V | ±10 V | ±10 V | ±10 V | ±10 V | ±10 V |
| Packaging Format | 1000-piece reel (T&R) | Larger reel T&R | Tube | Tube, E4 finish | Tube, E4 finish | Tube, green finish | Tube |
| Pin-Compatible Family | ADS7825 (16-bit) | ADS7825 (16-bit) | ADS7825 (16-bit) | ADS7825 (16-bit) | ADS7824 (12-bit, down-migrate) | ADS7824 (12-bit, down-migrate) | ADS7825 (16-bit) |
| RoHS Compliance | Compliant (G4 suffix indicates lead-free/RoHS) | Compliant | Compliant | Compliant (E4) | Compliant (E4) | Compliant (G4) | Compliant |
Key Differentiators
- Only 4-channel 12-bit SAR in 28-SOIC with on-chip ±10 V scaling resistors (vs ADS7817UBG4)
- Pin-compatible 16-bit upgrade path (vs ADS7825 family)
- Lowest power 4-channel 12-bit SAR with power-down to 50 µW (vs ADS7808UB/1K (8-channel))
Design Notes
Place a 10 µF tantalum and 0.1 µF ceramic bypass capacitor as close as possible to the VDD (pin 28) and VBD (pin 8) supplies, with a star-ground connection between AGND (pin 6) and DGND (pin 7) to avoid digital return currents in the analog ground reference. Use a ground plane on layer 2 with the analog input traces routed over the plane to minimize noise coupling. The 28-pin SOIC (DW) wide-body land pattern provides adequate thermal and electrical pad area for reliable hand or reflow soldering.
The ±10 V analog inputs (CH0-CH3) can be damaged by transients above ±15 V absolute maximum. Add 100 Ω series resistors and 1 nF capacitors on each analog input to provide RC filtering and transient protection while still allowing the input to settle within the 25 µs acquisition time. Keep the input traces short and away from digital lines (DB0-DB11, SCLK, SDATA) to prevent digital switching noise from coupling into the high-impedance analog inputs through parasitic capacitance.
Do not drive the analog inputs beyond ±15 V or permanent damage may result. Ensure CS is low before asserting R/C for a conversion, and do not read DB0-DB11 while BUSY is high. The PWRD pin (active low) must be tied high for normal operation; if left floating the part may enter power-down mode unintentionally. The internal 2.5 V reference has limited drive capability — do not draw more than a few microamps from VREF, or use an external reference for ratiometric applications.
At 50 mW maximum dissipation, the ADS7824UB/1KG4 does not require a heatsink, but the 28-pin SOIC (DW) package should be mounted with adequate copper pour on the power and ground pads to spread the heat. In a sealed enclosure with no airflow, verify the junction-to-ambient thermal resistance and derate power if multiple converters share the same supply. For battery-powered designs using power-down mode, the average dissipation scales with conversion duty cycle.
Compliance Information
RoHS compliant per TI product page and /G4 suffix. The /1KG4 suffix indicates lead-free 1000-piece reel packaging. Not AEC-Q100 qualified; for automotive applications consider a TI ADC in the AEC-Q100 portfolio.
