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Texas Instruments ADS7800KU/1K
- Part No.:
- ADS7800KU/1K
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS7800KU/1K.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,076
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Product details
Overview
ADS7800KU/1K from Texas Instruments is a 12-bit successive-approximation analog-to-digital converter (ADC) with internal sample/hold, reference, clock, and three-state parallel outputs. It delivers 333 kSPS throughput, ±10V/±5V bipolar input ranges, 2.7 µs max conversion time, and 72 dB SNR over temperature - used in precision data acquisition systems for industrial process control and test instrumentation.
For engineers reviewing the ADS7800KU/1K datasheet, ADS7800KU/1K pinout, ADS7800KU/1K application, or ADS7800KU/1K equivalent, key selection considerations include its 24-pin SOIC package, dual-supply operation (+5V/–12V or –15V), ±1/2 LSB integral linearity, internal 2.0 V reference, and compatibility with microprocessor buses via R/C, CS, and HBE control logic.
Technical Context
The ADS7800KU/1K implements a charge-redistribution SAR architecture with laser-trimmed thin-film scaling resistors to support precise ±10V and ±5V input ranges. Its internal 2.0 V reference drives a stable conversion core, and aperture jitter is specified at 150 ps rms for high-frequency signal fidelity.
Control is managed through three TTL/CMOS-compatible inputs: R/C initiates conversion on falling edge, CS enables output drivers, and HBE selects 12-bit parallel or 8-bit/4-bit byte-mode output. BUSY provides status synchronization, and all digital outputs are three-state with defined VOL/VOH levels under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4.88 mV LSB step size in ±10V range, enabling sub-millivolt measurement resolution. |
| Throughput Rate | 333 kSPS - supports real-time sampling of signals up to ~160 kHz Nyquist bandwidth. |
| Integral Linearity | ±1/2 LSB - ensures monotonicity and <0.012% full-scale error across temperature for calibrated systems. |
| Signal-to-Noise Ratio | 72 dB - corresponds to ~11.9 effective bits (ENOB) at 47 kHz input, critical for dynamic signal analysis. |
| Conversion Time | 2.7 µs max - guarantees total acquisition + conversion within 3.0 µs, enabling tight timing control in burst-mode DAQ. |
| Power Dissipation | 215 mW max - operates from +5V digital and –15V analog supplies, requiring thermal management in dense layouts. |
| Input Ranges | ±10V or ±5V - selected by grounding IN1 or IN2; input impedance is 6.3 kΩ (±10V) or 4.2 kΩ (±5V), dictating source drive requirements. |
Pinout & Package
ADS7800KU/1K is housed in a 24-lead SOIC (DW) package with 0.300" body width and standard JEDEC MS-013 outline. Pin spacing is 0.050", and the package is RoHS-compliant with Level-3 moisture sensitivity rating (260°C peak reflow, 168 hr floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1 | ±10V Analog Input | Connect signal source here for ±10V range; IN2 must be grounded. |
| IN2 | ±5V Analog Input | Connect signal source here for ±5V range; IN1 must be grounded. |
| REF | Internal Reference Output | 2.0 V ±0.1 V source; requires 22–47 µF tantalum bypass to AGND for stability. |
| HBE | High-Byte Enable | LOW = 12-bit parallel output on D0–D11; HIGH = 4 MSBs on D14–D17, D9–D12 forced LOW. |
| R/C | Read/Convert Control | Falling edge initiates conversion when CS=LOW and BUSY=HIGH; rising edge enables data read in Read Mode. |
| BUSY | Conversion Status | Active-low open-drain output; LOW during conversion, rising edge indicates data validity. |
| VSA, VSD | Analog/Digital +5V Supplies | Must be shorted externally and bypassed with 6.8 µF + 0.1 µF near pins; isolation prevents digital noise coupling. |
| –VS | Negative Supply | –12V or –15V analog supply; bypass with 1 µF tantalum; voltage affects full-scale error drift (±1/2 LSB over –13.5V to –11.4V). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Sample/Hold | Eliminates external S/H circuitry; 130 ns transient response ensures accurate capture of fast-rising signals. |
| Laser-Trimmed Scaling Resistors | Enables factory-calibrated ±10V/±5V input ranges without external gain-setting components. |
| Internal 2.0 V Reference | Stable ±50 mV output with 10 µA sourcing capability; reduces system BOM count and improves channel-to-channel matching. |
| Three-State Parallel Outputs | Supports direct connection to 8-bit or 12-bit microprocessor buses; HBE pin enables flexible data bus width configuration. |
| DC & AC Performance Guaranteed Over Temp | Specified from –40°C to +85°C: no missing codes, 72 dB SNR, 80 dB SFDR - suitable for unheated industrial enclosures. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous voltage monitoring of PLC analog I/O modules in chemical plant control cabinets. IC Role / Device Role / Timing Role: ADC front-end digitizing 4–20 mA loop signals conditioned to ±10V range with 3 µs cycle time. Use Value: 12-bit resolution and ±1/2 LSB linearity ensure <0.025% measurement repeatability across ambient temperature swings. | Use Scenario: High-speed parametric testing of op amps using synchronized stimulus-response capture. IC Role / Device Role / Timing Role: Sampling amplifier output at 333 kSPS while triggered by pattern generator's R/C pulse. Use Value: Internal clock and BUSY-synchronized readout eliminate external timing controller, reducing ATE system latency. |
| Power Quality Analyzers | Medical Instrumentation Signal Chain |
Use Scenario: Digitizing AC mains waveforms (50/60 Hz ± harmonics up to 3 kHz) for THD and RMS calculation. IC Role / Device Role / Timing Role: Precision ADC capturing voltage/current transducer outputs with 72 dB SNR and –80 dB THD. Use Value: Spurious-free dynamic range of 80 dB suppresses harmonic distortion artifacts in spectral analysis algorithms. | Use Scenario: Biopotential acquisition in portable ECG devices requiring low-noise, low-power analog front-end. IC Role / Device Role / Timing Role: Converting amplified electrode signals (±5V range) with minimal added noise and deterministic latency. Use Value: Aperture jitter of 150 ps rms preserves signal integrity for accurate QRS complex detection at 1 kSPS oversampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7804U | 12-bit, 100 kSPS, single-supply (+5V only), no internal reference - requires external REF and S/H. | Lower speed, simpler power scheme; suited for battery-powered portable instruments with relaxed throughput needs. | Select ADS7804U only if system-level simplification outweighs loss of 3.3× throughput and internal reference convenience. |
| AD7892BRZ-1 | 12-bit, 200 kSPS, ±10V input, internal reference, but uses serial SPI interface instead of parallel outputs. | Reduces PCB trace count and layout complexity; incompatible with legacy 12-bit parallel bus architectures. | Choose AD7892BRZ-1 when board space is constrained and microcontroller supports SPI - not for direct replacement in existing parallel-data systems. |
Compared with ADS7800KU/1K, ADS7804U trades speed and integration for lower power and single-supply operation, while AD7892BRZ-1 replaces parallel interface flexibility with serial simplicity and reduced pin count - neither offers identical timing, packaging, or bus compatibility.
Availability
ADS7800KU/1K is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, power quality analyzers, and medical instrumentation requiring stable component supply across extended temperature ranges.
Supply support for ADS7800KU/1K includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of heritage in precision data converters.
The ADS7800 series was designed for high-accuracy, medium-speed data acquisition in industrial and instrumentation applications where internal integration, DC accuracy, and AC performance over temperature are critical.
FAQ
What is the maximum sampling rate supported by the ADS7800KU/1K?
The ADS7800KU/1K is specified for a maximum throughput rate of 333 kSPS, with a guaranteed maximum conversion time of 2.7 µs and total acquisition + conversion time of 3.0 µs over the full operating temperature range (–40°C to +85°C). This rate is enabled by its internal factory-trimmed clock and optimized charge-redistribution SAR architecture.
Does the ADS7800KU/1K require an external reference voltage?
No, the ADS7800KU/1K includes an internal 2.0 V reference (±0.1 V) available at pin 3 (REF), which is laser-trimmed and buffered for stability. While it can drive light external loads (≤10 µA), the reference is intended primarily for internal use; external buffering is required if routing to other devices.
How does the HBE pin affect data output format on the ADS7800KU/1K?
When HBE is LOW, the ADS7800KU/1K outputs all 12 bits in parallel on pins D0–D11. When HBE is HIGH, it enters byte-mode: pins D14–D17 carry the 4 MSBs, and pins D9–D12 are forced LOW - enabling interface with 8-bit data buses while preserving access to full resolution across two cycles.
What power supply voltages are required for proper operation of the ADS7800KU/1K?
The ADS7800KU/1K requires three supplies: +5V applied to both VSA (pin 24) and VSD (pin 23), which must be shorted externally; and a negative analog supply of –12V or –15V on –VS (pin 22). The device draws up to 25 mA from +5V and 6 mA from –15V, totaling ≤215 mW max power dissipation.
Can the ADS7800KU/1K operate in standalone mode without a microprocessor interface?
Yes, the ADS7800KU/1K supports standalone operation using only the R/C pin: tie CS and HBE to GND, apply periodic falling-edge pulses to R/C, and read 12-bit data on the rising edge of BUSY. This eliminates bus arbitration logic and is ideal for dedicated analog input ports in fixed-function systems.
ADS7800KU/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 333k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V, -11.4V ~ 16.5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7800KU/1K FAQ
1.How can I place an order for ADS7800KU/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7800KU/1K on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS7800KU/1K reliable?
The price and inventory of ADS7800KU/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7800KU/1K is usually 5 days.
3.What payment methods are accepted for ADS7800KU/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7800KU/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7800KU/1K?
ADS7800KU/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7800KU/1K order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS7800KU/1K?
For technical support, including ADS7800KU/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7800KU/1K requirements.
6.How does Aetrix verify that ADS7800KU/1K is sourced from the original manufacturer or authorized distributors?
All ADS7800KU/1K products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS7800KU/1K meets industry standards.
7.What is the process for return or replacement of ADS7800KU/1K?
All ADS7800KU/1K units undergo pre-shipment inspection (PSI). If there is an issue with ADS7800KU/1K, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS7800KU/1K part is unused and in its original packaging.
Return procedure for ADS7800KU/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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