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Texas Instruments ADS7800JU/1K
- Part No.:
- ADS7800JU/1K
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS7800JU/1K.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,719
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Product details
Overview
ADS7800JU/1K from Texas Instruments is a 12-bit successive-approximation analog-to-digital converter (SAR 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. It is used in precision data acquisition systems requiring fast, high-resolution digitization of industrial sensor signals.
For engineers reviewing the ADS7800JU/1K datasheet, ADS7800JU/1K pinout, ADS7800JU/1K application, or ADS7800JU/1K equivalent, key selection considerations include its factory-trimmed 2.7 µs conversion time, dual-range ±10V/±5V analog input interface, internal 2.0 V reference output, SOIC-24 package compatibility, and support for both 12-bit parallel and 8-bit/4-bit byte-mode readout via HBE control.
Technical Context
The ADS7800JU/1K implements a charge-redistribution SAR architecture with laser-trimmed thin-film scaling resistors to maintain ±10V and ±5V input range accuracy across temperature. Its internal clock is factory trimmed to guarantee ≤2.7 µs conversion time over –40°C to +85°C, and aperture jitter is specified at 150 ps rms.
It features separate analog (VSA) and digital (VSD) +5 V supplies, isolated AGND/DGND pins, and an internal 2.0 V reference (REF) buffered for external bypassing. Control logic supports two operational modes-Convert Mode (R/C falling edge initiates conversion) and Read Mode (R/C rising edge enables prior result)-with BUSY signaling conversion status and output enable timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR architecture ensures 1 LSB = 4.88 mV (±10V range) or 2.44 mV (±5V range), enabling precise industrial voltage measurement. |
| Throughput Rate | 333 kSPS maximum sampling rate with ≤3.0 µs total acquisition + conversion time, suitable for real-time waveform capture. |
| Input Ranges | Factory-supported ±10V (pin 1) or ±5V (pin 2) bipolar inputs; impedance is 6.3 kΩ (±10V) or 4.2 kΩ (±5V), requiring low-source-impedance signal conditioning. |
| AC Performance | 72 dB SNR and 80 dB SFDR at fIN = 47 kHz confirm suitability for medium-bandwidth instrumentation applications. |
| DC Accuracy | ±1/2 LSB integral linearity error and ±3/4 LSB differential linearity error ensure monotonicity and minimal code-width variation over temperature. |
| Power Supply | +5 V (VSA/VSD), –12 V or –15 V (–VS); 215 mW max dissipation enables use in thermally constrained embedded systems. |
| Reference | Internal 2.0 V ±0.1 V reference output (pin 3) with 10 µA drive capability; requires 22–47 µF tantalum bypass for stability. |
Pinout & Package
ADS7800JU/1K is housed in a 24-pin SOIC (DW) package with 1.27 mm pitch, RoHS-compliant, moisture sensitivity level 3 (260°C peak reflow, 168 hr floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN1) | ±10V Analog Input | Connect signal source for ±10V range; pin 2 must be grounded. |
| 2 (IN2) | ±5V Analog Input | Connect signal source for ±5V range; pin 1 must be grounded. |
| 3 (REF) | 2.0 V Reference Output | Buffered internal reference; bypass to AGND with 22–47 µF tantalum capacitor. |
| 4 (AGND) | Analog Ground | Must be directly connected to DGND (pin 13); serves as analog signal return path. |
| 5–17 (D11–D0) | Parallel Data Outputs | 12-bit offset binary output; D11 (MSB) to D0 (LSB); three-state controlled by CS/HBE/BUSY. |
| 18 (HBE) | High-Byte Enable | LOW = 12-bit parallel mode; HIGH = 4 MSBs on pins 14–17, pins 9–12 forced LOW for 8-bit bus interfacing. |
| 19 (R/C) | Read/Convert Control | Falling edge initiates conversion when CS=LOW and BUSY=HIGH; rising edge enables data read in Read Mode. |
| 20 (CS) | Chip Select | LOW enables conversion initiation and data readout; HIGH places outputs in Hi-Z state. |
| 21 (BUSY) | Conversion Status | Active-low open-drain output; LOW during conversion; rising edge indicates data validity. |
| 22 (–VS) | Negative Power Supply | Accepts –12 V or –15 V; bypass to AGND with 1 µF tantalum capacitor near pin. |
| 23 (VSD) | Digital +5 V Supply | Must be tied to pin 24 (VSA); bypass with 6.8 µF + 0.1 µF capacitors for noise immunity. |
| 24 (VSA) | Analog +5 V Supply | Must be tied to pin 23 (VSD); separate routing from digital supplies recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Sample/Hold + Reference + Clock | Eliminates need for external components in basic configurations; reduces board area and calibration complexity. |
| Factory-Trimmed Conversion Time | Guaranteed ≤2.7 µs over –40°C to +85°C enables deterministic timing without external clock management. |
| Bipolar Input Flexibility | Single device supports ±10V or ±5V ranges via pin-strapping (IN1/IN2), simplifying design reuse across sensor types. |
| Three-State Parallel Output Interface | Direct microprocessor bus connection with CS/R/C/HBE control; supports 12-bit or split 8-bit/4-bit readout. |
| Separate Analog/Digital Supplies | VSA/VSD isolation minimizes digital switching noise coupling into analog conversion path. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Digitizing 4–20 mA current loop outputs converted to ±10V via precision shunt in PLC I/O modules. IC Role / Device Role / Timing Role: Primary SAR ADC performing synchronized 333 kSPS sampling with <3 µs latency for closed-loop feedback control. Use Value: 12-bit resolution and ±1/2 LSB INL ensure accurate representation of process variables like pressure or temperature within 0.025% full-scale error. |
Use Scenario: Capturing transient waveforms from oscilloscope front-ends or automated test fixtures. IC Role / Device Role / Timing Role: High-speed data acquisition core with internal S/H and reference, reducing external component count. Use Value: 72 dB SNR and 80 dB SFDR enable clean spectral analysis of signals up to 47 kHz without external dither or averaging. |
| Motor Drive Current Sensing | Medical Instrumentation Signal Chain |
|
Use Scenario: Sampling phase currents in servo drives using isolated amplifiers with ±5V output swing. IC Role / Device Role / Timing Role: Bipolar ADC interfaced to isolated op-amp outputs; uses IN2 pin for ±5V range and HBE for 8-bit bus compatibility. Use Value: 2.7 µs conversion time allows sampling within tight PWM dead-time windows, supporting high-frequency field-oriented control. |
Use Scenario: Digitizing ECG or EEG amplifier outputs in portable diagnostic devices requiring low power and high fidelity. IC Role / Device Role / Timing Role: Precision ADC in battery-powered analog front-end; leverages internal 2.0 V REF and low-noise layout guidance. Use Value: Internal reference stability (±0.1 V) and 150 ps aperture jitter preserve signal integrity for sub-microvolt-level bio-potential measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7804U | 12-bit, 100 kSPS, single-ended input only, no internal reference, requires external clock. | Lacks bipolar input flexibility and integrated reference; suited for lower-speed, cost-sensitive designs with external timing. | Select ADS7804U only if throughput <100 kSPS suffices and system already provides stable reference/clock. |
| ADS8320EB | 16-bit, 100 kSPS, SPI interface, internal reference, no ±10V range support. | Higher resolution but slower and serial-only; incompatible with parallel bus systems and wide-voltage industrial sensors. | Choose ADS8320EB for precision low-speed applications where resolution >12-bit is critical and SPI is acceptable. |
Compared with ADS7800JU/1K, ADS7804U trades speed and integration for cost reduction, while ADS8320EB prioritizes resolution and serial simplicity over throughput and bipolar range support-neither offers drop-in replacement capability due to pinout, interface, or voltage-range mismatches.
Availability
ADS7800JU/1K is available at Aetrix Electronics and suitable for industrial automation, test equipment, motor control, and medical instrumentation requiring stable component supply across extended temperature ranges.
Supply support for ADS7800JU/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 expertise in precision data converters.
The ADS7800JU/1K belongs to TI's legacy high-speed precision SAR ADC family, designed specifically for industrial and instrumentation applications demanding fast, accurate, and robust analog-to-digital conversion with minimal external components.
FAQ
What is the guaranteed maximum conversion time for ADS7800JU/1K over temperature?
The ADS7800JU/1K guarantees a maximum conversion time of 2.7 µs over its full operating temperature range of –40°C to +85°C. This value is factory-trimmed and does not require external clock adjustment. The ADS7800JU/1K achieves this performance using an internal CMOS-based successive approximation register and charge-redistribution architecture with laser-trimmed scaling resistors.
Does ADS7800JU/1K support both ±10V and ±5V input ranges simultaneously?
No, the ADS7800JU/1K supports either ±10V or ±5V input range per configuration-not both simultaneously. Pin 1 (IN1) is used for ±10V input with pin 2 grounded; pin 2 (IN2) is used for ±5V input with pin 1 grounded. The ADS7800JU/1K's internal scaling resistors are laser-trimmed for each range separately, and mixing connections invalidates accuracy specifications.
What is the function of the HBE pin on ADS7800JU/1K, and how does it affect data output?
The HBE (High-Byte Enable) pin on ADS7800JU/1K selects between 12-bit parallel and 8-bit/4-bit byte-mode output. When HBE is LOW, all 12 bits appear on pins 5–17. When HBE is HIGH, pins 14–17 output the 4 MSBs and pins 9–12 output LOW, enabling compatibility with 8-bit microprocessor buses. The ADS7800JU/1K requires HBE to be LOW to initiate conversion.
Can ADS7800JU/1K operate with only a +5V supply, or does it require negative voltage?
The ADS7800JU/1K requires three supplies: +5 V on both VSA (pin 24) and VSD (pin 23), and a negative supply (–12 V or –15 V) on –VS (pin 22). It cannot operate with only +5 V-the negative rail is essential for bipolar input signal handling and internal comparator operation. The ADS7800JU/1K draws up to 6 mA from –VS and 25 mA from +5 V under full load.
What is the purpose of separate VSA and VSD pins on ADS7800JU/1K, and how should they be connected?
VSA (pin 24) and VSD (pin 23) are physically separate +5 V supply pins for analog and digital circuitry respectively. They must be externally tied together and bypassed with a 6.8 µF tantalum + 0.1 µF ceramic capacitor pair near the ADS7800JU/1K. This separation minimizes digital switching noise coupling into the analog conversion path, preserving the ADS7800JU/1K's 72 dB SNR and 80 dB SFDR performance.
ADS7800JU/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:
- -
ADS7800JU/1K FAQ
1.How can I place an order for ADS7800JU/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7800JU/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 ADS7800JU/1K reliable?
The price and inventory of ADS7800JU/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7800JU/1K is usually 5 days.
3.What payment methods are accepted for ADS7800JU/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7800JU/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7800JU/1K?
ADS7800JU/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7800JU/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 ADS7800JU/1K?
For technical support, including ADS7800JU/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7800JU/1K requirements.
6.How does Aetrix verify that ADS7800JU/1K is sourced from the original manufacturer or authorized distributors?
All ADS7800JU/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 ADS7800JU/1K meets industry standards.
7.What is the process for return or replacement of ADS7800JU/1K?
All ADS7800JU/1K units undergo pre-shipment inspection (PSI). If there is an issue with ADS7800JU/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 ADS7800JU/1K part is unused and in its original packaging.
Return procedure for ADS7800JU/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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