ADS7800KPG4 - 12-Bit 333kSPS SAR ADC, 24-PDIP | Texas Instruments
MPN: ADS7800KPG4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $24.5 | $24.50 |
| 10 | $22.1 | $221.00 |
| 100 | $19.75 | $1,975.00 |
| 500 | $17.95 | $8,975.00 |
| 1,000 | $16.2 | $16,200.00 |
ADS7800KPG4 Overview
An SAR ADC is a successive-approximation-register analog-to-digital converter, a class of precision data converter that uses a binary-search algorithm against an internal DAC to digitize an input voltage one bit at a time within a fixed conversion window. SAR ADCs occupy the middle of the data-converter hierarchy between flash (fastest, lowest resolution) and sigma-delta (highest resolution, slowest); they deliver a useful blend of speed, resolution, and low latency that makes them ideal for multiplexed data acquisition, industrial control, and instrumentation front-ends.
The ADS7800KPG4 features three analog input ranges (0 V to 5 V, 0 V to 10 V, and ±5 V to ±10 V with appropriate scaling), a sample-and-hold on the front end, and an internal +2.5 V reference. An optional external reference may be applied for system calibration. Throughput is rated at 333 k samples per second, enabling the part to digitize signals in audio bandwidth and process-control applications.
Typical applications include multichannel data-acquisition systems, industrial process control, precision instrumentation, and digital signal processing front-ends. Designers value the part for its easy microprocessor interface, robust sampling rate, and wide analog input range flexibility. Designers should observe standard SAR ADC practices: drive the analog input with a low-impedance buffer, decouple supplies near the pins, and keep digital returns separate from analog returns.
Drop-in alternatives for ADS7800KPG4 — 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 ADS7800KPG4 (same form factor and footprint) — differing in Architecture, Operating Temperature, Sampling Rate, Data Interface, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS7800KP
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADS7800JP
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADS7800JP-ND
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7800BH
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7800AH
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADS7800KPG4 Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Sampling Rate | 333 kSPS (3 us conversion) |
| Number of Input Channels | 1 |
| Architecture | SAR (Successive Approximation) |
| Data Interface | Parallel |
| Package / Case | 24-PDIP (0.300 inch / 7.62 mm) |
| Supply Voltage (Positive) | +5 V |
| Supply Voltage (Negative) | -12 V or -15 V |
| Operating Temperature | 0C to +70C (commercial) |
| Mounting Type | Through-Hole |
| Packaging | Tube |
| Linearity Error (K grade) | 0.0244% (max) |
| Number of Terminals | 24 |
| RoHS Status | Compliant |
| Input Type | Single-Ended |
ADS7800KPG4 Pin Configuration
| Pin 1 | VIN — Analog input |
| Pin 2 | AGND — Analog ground |
| Pin 3 | REF — Reference voltage input/output (+2.5V) |
| Pin 4 | CAP — Reference bypass capacitor |
| Pin 5 | VANA — Analog +5V supply |
| Pin 6 | VDIG — Digital +5V supply |
| Pin 7 | RANGE — Input range select |
| Pin 8 | OF1 — Offset adjust 1 |
| Pin 9 | OF2 — Offset adjust 2 |
| Pin 10 | GND — Ground |
| Pin 11 | DB11 — Data bit 11 (MSB) |
| Pin 12 | DB10 — Data bit 10 |
| Pin 13 | DB9 — Data bit 9 |
| Pin 14 | DB8 — Data bit 8 |
| Pin 15 | DB7 — Data bit 7 |
| Pin 16 | DB6 — Data bit 6 |
| Pin 17 | DB5 — Data bit 5 |
| Pin 18 | DB4 — Data bit 4 |
| Pin 19 | DB3 — Data bit 3 |
| Pin 20 | DB2 — Data bit 2 |
| Pin 21 | DB1 — Data bit 1 |
| Pin 22 | DB0 — Data bit 0 (LSB) |
| Pin 23 | RC — Read/Convert input |
| Pin 24 | BUSY — Busy output (low during conversion) |
Typical Applications
ADS7800KPG4 is suitable for 6 applications: Multichannel Data Acquisition Systems, Industrial Process Control, Precision Instrumentation Front-End, DSP and Embedded Processor Front-End, Audio Bandwidth Sampling Systems, Legacy Through-Hole Industrial Boards.
Multichannel Data Acquisition Systems
The ADS7800KPG4's 12-bit resolution, 333 kSPS throughput, and parallel digital interface make it an ideal front-end for multichannel data-acquisition (DAQ) systems that scan multiple analog sensors and stream digitized data to a host processor. Per the TI datasheet, the conversion-start and BUSY handshake signals allow a single ADC to be time-multiplexed across an external analog switch array, dramatically reducing BOM cost versus per-channel ADCs. The 3 us conversion time keeps total scan latency low even at high channel counts, while the +/-10 V bipolar input range directly accepts industrial transducer outputs without external signal conditioning. Designers should buffer the analog input with a low-impedance op-amp to preserve the sample-and-hold settling within the acquisition window.
Recommended
Industrial Process Control
In industrial process-control loops the ADS7800KPG4 digitizes 4-20 mA or 0-10 V sensor signals representing temperature, pressure, flow, and level. The K-grade linearity of 0.0244 percent provides adequate DC accuracy for closed-loop control without on-board calibration, and the parallel bus allows the host PLC or microcontroller to read conversion results with deterministic latency. Per the TI datasheet, the commercial 0-70C operating range suits control-room environments, while the -12 V/-15 V negative supply supports the bipolar +/-10 V input ranges common in legacy process instrumentation. Designers should isolate digital and analog ground returns to prevent switching noise from coupling into the SAR comparator.
Recommended
Precision Instrumentation Front-End
Test and measurement instrumentation such as benchtop DMMs, spectrum analyzers, and oscilloscope front-ends benefit from the ADS7800KPG4's 12-bit resolution and 333 kSPS real-time sampling rate. The internal +2.5 V reference can be overdriven by an external precision reference (such as the REF01 or REF02) for improved absolute accuracy, and the sample-and-hold front end preserves input amplitude during the 3 us conversion window. According to TI documentation, the bipolar input capability simplifies signal conditioning for sensors that swing around ground, while the parallel bus interfaces cleanly to legacy instrument microcontrollers. The through-hole 24-PDIP package is preferred in lab-grade instruments for serviceability and rework.
Recommended
DSP and Embedded Processor Front-End
The ADS7800KPG4's parallel 12-bit data bus is designed for direct connection to legacy DSPs and embedded microprocessors such as the TMS320C25 or 8051-family MCUs that lack high-speed serial ADC interfaces. Per the TI datasheet, the RC (read/convert) and BUSY signals implement a clean hardware handshake, freeing the host from tight software timing. With 333 kSPS throughput, the ADS7800KPG4 easily feeds real-time DSP algorithms in motor-control and audio-processing applications. Designers should place the ADC on a dedicated analog ground island and route the parallel digital bus over a continuous ground plane to minimize digital-to-analog crosstalk.
Recommended
Audio Bandwidth Sampling Systems
Audio sampling systems running at 44.1 kHz, 48 kHz, or 96 kHz fit comfortably within the ADS7800KPG4's 333 kSPS envelope, leaving substantial headroom for anti-aliasing filter settling and host-side processing. While 12-bit resolution limits SNR to roughly 72 dB (adequate for voice and general audio, not audiophile-grade), the parallel interface and simple RC/BUSY control make the part attractive for cost-sensitive audio front-ends, two-way radio digitizers, and legacy sound-card designs. Per the TI datasheet, the bipolar +/-5 V input range directly accepts line-level audio signals with minimal external circuitry, reducing the BOM for consumer and prosumer audio products.
Recommended
Legacy Through-Hole Industrial Boards
Many legacy industrial controllers, PLCs, and CNC machine interfaces still use through-hole 24-pin DIP ADCs and have no SOIC footprint available on the board. The ADS7800KPG4's 24-PDIP package is specifically designed for these retrofit and maintenance scenarios, allowing direct socketed or soldered replacement of failed original ADCs. Per the TI datasheet, the part is fully form-fit-function compatible with prior-generation DIP-24 ADC sockets from TI and competitors. The through-hole construction also simplifies field replacement by technicians without requiring reflow equipment, which is critical for legacy industrial equipment with 10-20 year service lifetimes.
Recommended
Recommended Products Summary
Engineering reference data for ADS7800KPG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS7800KP | ADS7800JP | ADS7800BH | ADS7800AH |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 24-PDIP (0.300 inch) | 24-PDIP (0.300 inch) | 24-PDIP (0.300 inch) | 24-PDIP side-braze hermetic | 24-PDIP side-braze hermetic |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 333 kSPS | 333 kSPS | 333 kSPS | 333 kSPS | 333 kSPS |
| Linearity (INL max) | 0.0244% (K grade) | 0.0244% (K grade) | 0.0488% (J grade) | 0.0244% (BH grade) | 0.0488% (AH grade) |
| Operating Temperature | 0C to +70C | 0C to +70C | 0C to +70C | -25C to +85C (extended) | -40C to +85C (industrial) |
| Positive Supply | +5 V | +5 V | +5 V | +5 V | +5 V |
| Negative Supply | -12 V or -15 V | -12 V or -15 V | -12 V or -15 V | -12 V or -15 V | -12 V or -15 V |
Key Differentiators
- Lead-free RoHS-compliant finish in legacy through-hole 24-PDIP package (vs ADS7800KP)
- K-grade tighter linearity for precision DC measurements (vs ADS7800JP)
- Through-hole 24-PDIP package for legacy socket compatibility (vs ADS7800KU)
Design Notes
The ADS7800KPG4 requires a clean +5 V supply plus a -12 V or -15 V negative rail for the bipolar input scaling and reference circuitry. Place 10 uF tantalum and 0.1 uF ceramic decoupling capacitors close to each supply pin. The negative supply should be regulated; ripple above 50 mVpp can couple into the analog input path and degrade SNR. A linear low-noise regulator (such as an LM7905 or LT1033) is preferred over switching converters for the negative rail.
Use a split ground plane with the analog section (input, REF, AGND) isolated from the digital section (DB0-DB11, RC, BUSY, DGN). Join the two ground islands at a single point near the ADC's GND pin. Route the parallel digital data bus over the digital ground plane only, and keep analog input traces short and direct to minimize capacitive coupling from the digital switching edges into the analog front end.
Do not omit the reference bypass capacitor on the CAP pin - it is required for ADC stability and low noise. Do not exceed the maximum analog input voltage range after the input scaling resistors (the internal scaling network translates +/-10 V to within the +5 V core range, so overdrive will damage the part). Ensure the RC (read/convert) pulse width meets the minimum specification in the datasheet timing table or conversion will not initiate reliably.
Buffer the analog input with a low-impedance op-amp (such as the OPA227 or OPA627) to preserve the SAR sample-and-hold settling within the acquisition window. The ADS7800KPG4's input sampling capacitor draws charge transients at the start of each conversion; without a buffer, source impedance above 1 kohm will introduce gain error and degrade linearity. Place the buffer within 25 mm of the ADC input pin and use a ground plane to minimize parasitic inductance.
Compliance Information
RoHS compliant per the G4 suffix designation. Lead-free finish per JEDEC J-STD-020. Halogen-free status not explicitly listed in distributor data - mark as unknown. Not AEC-Q100 qualified (industrial/consumer grade only).
