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Texas Instruments ADS8504IBDWR
- Part No.:
- ADS8504IBDWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS8504IBDWR.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:927
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Product details
Overview
ADS8504IBDWR from Texas Instruments is a 12-bit, 250-kSPS successive-approximation register (SAR) analog-to-digital converter with ±10-V input range, internal 2.5-V reference, full parallel 2's complement output, and single +5-V supply operation. It delivers 73-dB SINAD at 45-kHz input, ±0.45 LSB max INL/DNL, and operates across –40°C to +85°C in industrial data acquisition systems.
For engineers reviewing the ADS8504IBDWR datasheet, ADS8504IBDWR pinout, ADS8504IBDWR application, or ADS8504IBDWR equivalent, key selection considerations include bipolar zero error drift (±0.4 ppm/°C), bus access timing (83 ns), conversion cycle time (4 µs), and compatibility with microprocessor parallel interfaces requiring 12-bit 2's complement format and BYTE-selectable 8-bit reads.
Technical Context
The ADS8504IBDWR implements a capacitor-based SAR architecture with integrated sample-and-hold, internal reference buffer, and three-state parallel drivers. Its control logic supports dual-mode operation via CS/R/C pin combination: falling edge on either initiates conversion, rising edge on R/C enables output latching when CS is low.
It features a resistive front-end network providing inherent ±25-V overvoltage protection and 11.5-kΩ input impedance. The internal 2.5-V reference (±8 ppm/°C drift) drives a buffered CAP pin requiring a 2.2-µF tantalum capacitor; external reference range is 2.3 V to 2.7 V for full linearity compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - defines quantization step of 4.88 mV over ±10-V range |
| Sampling Rate | 250 kSPS - enables real-time capture of signals up to 125 kHz Nyquist bandwidth |
| INL / DNL | ±0.45 LSB max - ensures monotonicity and <0.1% full-scale linearity error |
| SINAD | 73 dB at 45 kHz - supports >11.5 ENOB for precision measurement applications |
| Power Dissipation | 70 mW typ at 250 kSPS - allows thermal management in dense industrial PCB layouts |
| Input Range | ±10 V - matches standard industrial sensor and PLC signal levels without external scaling |
| Supply Voltage | +5 V (±5%) - simplifies power design using common LDO or switching regulator rails |
Pinout & Package
ADS8504IBDWR is housed in a 28-pin SOIC (DW) package with 1.27-mm pitch, rated for industrial temperature range (–40°C to +85°C) and ΘJA = 46°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Analog input | ±10-V differential input referenced to AGND1; includes ±25-V overvoltage protection |
| AGND1 (2) | Analog ground reference | Primary analog signal reference point; must connect to low-impedance analog ground plane |
| REF (3) | Reference I/O | Internal 2.5-V ref output or external ref input (2.3–2.7 V); requires 2.2-µF decoupling |
| CAP (4) | Reference buffer output | Buffered ref output driving CDAC; 2.2-µF capacitor essential for stable conversion |
| AGND2 (5) | Analog supply ground | Ground return for VANA; tied to AGND1 externally for optimal noise isolation |
| D11–D0 (6–13, 15–18) | Parallel data outputs | 12-bit 2's complement output; Hi-Z when CS high or R/C low; BYTE pin selects MSB/LSB byte |
| BUSY (26) | Status output | Active-low conversion status; goes high 5 ns after conversion completion to latch valid data |
| CS (25) & R/C (24) | Control inputs | OR'ed logic: falling edge initiates conversion; rising edge enables output when CS low |
Key Features
| Feature | Design Value |
|---|---|
| Full parallel 12-bit 2's complement interface | Enables direct connection to 8051, ARM Cortex-M, or FPGA GPIO buses without serialization overhead |
| BYTE-selectable 8-bit read mode | Reduces microcontroller I/O count by allowing two 8-bit reads per conversion cycle |
| Internal ±10-V input scaling network | Eliminates external gain/attenuation circuitry for standard industrial sensor interfacing |
| ±25-V absolute maximum input rating | Provides robust field survivability against transient surges without external TVS or clamping |
| Single +5-V supply operation | Removes need for dual ±15-V supplies common in legacy data acquisition designs |
Applications
| Industrial Process Control | Data Acquisition Systems |
|---|---|
Use Scenario: Monitoring pressure, temperature, and flow sensors in PLC-controlled manufacturing lines. IC Role / Device Role / Timing Role: Primary ADC capturing synchronized multi-channel analog sensor data at 250 kSPS for real-time closed-loop control. Use Value: ±0.45 LSB INL ensures <0.1% measurement accuracy across full ±10-V range, critical for regulatory compliance in process automation. |
Use Scenario: High-fidelity waveform capture in portable test equipment and benchtop DAQ modules. IC Role / Device Role / Timing Role: Standalone sampling ADC interfaced to FPGA or microcontroller for streaming digitized waveforms. Use Value: 73-dB SINAD at 45 kHz enables >11.5 ENOB performance, supporting IEEE 1057-compliant calibration-grade measurements. |
| Medical Equipment | Instrumentation |
Use Scenario: Analog front-end for patient monitoring devices measuring ECG, respiration, and blood oxygen signals. IC Role / Device Role / Timing Role: Precision ADC converting conditioned biopotential signals with low-noise, low-drift requirements. Use Value: ±0.4 ppm/°C bipolar zero error drift minimizes baseline drift over operating temperature, improving diagnostic reliability. |
Use Scenario: Embedded digitizer in automated test equipment (ATE) and calibration standards. IC Role / Device Role / Timing Role: High-stability ADC used with external 2.5-V reference for traceable metrology-grade measurements. Use Value: External reference support (2.3–2.7 V) enables use of ultra-low-drift references to achieve <±0.05% FSR total error. |
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 |
|---|---|---|---|
| ADS7804UB | 12-bit, 10-kSPS max; no internal reference; requires external ±10-V reference and clock | Limited to low-speed, low-power applications where throughput <10 kSPS suffices | Select only when system-level clock and reference generation already exist and power budget is constrained |
| ADS8505IBDWR | 16-bit, same 28-pin SOIC footprint; 250-kSPS; identical interface and timing; higher resolution but 2× power | Used where >12-bit ENOB required for dynamic signal analysis or spectral purity validation | Drop-in upgrade path if board layout accommodates increased thermal dissipation (100 mW vs. 70 mW) |
Compared with ADS7804UB, ADS8504IBDWR offers 25× higher throughput and integrated reference; compared with ADS8505IBDWR, it trades 4-bit resolution for lower power and cost while retaining identical pinout and software interface-ideal for cost-sensitive industrial DAQ where 12-bit fidelity meets specification.
Availability
ADS8504IBDWR is available at Aetrix Electronics and suitable for industrial process control, medical equipment, data acquisition systems, and instrumentation requiring stable component supply and long-term production continuity.
Supply support for ADS8504IBDWR 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 precision data converter heritage.
The ADS8504IBDWR belongs to TI's high-accuracy SAR ADC product line, designed specifically for industrial and medical applications demanding ±10-V input compatibility, low drift, and microprocessor-friendly parallel interfaces.
FAQ
What is the maximum sampling rate supported by the ADS8504IBDWR?
The ADS8504IBDWR supports a maximum sampling rate of 250 kSPS across its full industrial temperature range (–40°C to +85°C). This is achieved with a 4-µs conversion cycle time, including both acquisition and conversion phases. At this rate, the device maintains specified AC performance including 73-dB SINAD at 45-kHz input frequency and ±0.45 LSB INL/DNL accuracy.
Does the ADS8504IBDWR require an external reference voltage?
No-the ADS8504IBDWR includes an internal 2.5-V reference with ±8 ppm/°C typical drift and 2.48 V to 2.52 V tolerance. However, it also supports external reference voltages from 2.3 V to 2.7 V applied to the REF pin. Using an external ultra-low-drift reference improves full-scale error stability, especially in metrology-grade applications where the internal reference contributes ~20% of total FSE.
How does the BYTE pin function on the ADS8504IBDWR?
The BYTE pin (Pin 23) on the ADS8504IBDWR controls data bus partitioning: when LOW, pins D11–D4 output the 8 most significant bits (MSB byte); when HIGH, pins D3–D0 and D11–D4 output the 8 least significant bits (LSB byte). This allows 8-bit microcontrollers to read the full 12-bit result in two cycles without requiring 12-bit-wide I/O ports, reducing system-level pin count and firmware complexity.
What is the purpose of the CAP pin on the ADS8504IBDWR?
The CAP pin (Pin 4) is the output of the internal reference buffer and must be decoupled with a 2.2-µF tantalum capacitor to ground. This capacitor supplies instantaneous charge to the CDAC during conversion and stabilizes the reference buffer. Using a smaller capacitor (<1 µF) risks oscillation and insufficient charge delivery, degrading SNR and causing missing codes; larger values (>2.2 µF) yield diminishing returns and increase board area.
Can the ADS8504IBDWR operate from a single +5-V supply?
Yes-the ADS8504IBDWR is fully specified for single +5-V supply operation (VDIG = VANA = 4.75 V to 5.25 V). Its CMOS SAR architecture and integrated analog front-end eliminate the need for ±15-V supplies traditionally used in precision ADCs. Power dissipation remains at 70 mW typical at 250 kSPS, enabling compact thermal design in space-constrained industrial enclosures.
ADS8504IBDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 250k
- 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:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8504IBDWR FAQ
1.How can I place an order for ADS8504IBDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8504IBDWR 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 ADS8504IBDWR reliable?
The price and inventory of ADS8504IBDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8504IBDWR is usually 5 days.
3.What payment methods are accepted for ADS8504IBDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8504IBDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8504IBDWR?
ADS8504IBDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8504IBDWR 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 ADS8504IBDWR?
For technical support, including ADS8504IBDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8504IBDWR requirements.
6.How does Aetrix verify that ADS8504IBDWR is sourced from the original manufacturer or authorized distributors?
All ADS8504IBDWR 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 ADS8504IBDWR meets industry standards.
7.What is the process for return or replacement of ADS8504IBDWR?
All ADS8504IBDWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8504IBDWR, 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 ADS8504IBDWR part is unused and in its original packaging.
Return procedure for ADS8504IBDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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