ADS8505IDBRG4 - 16-Bit 250kSPS SAR ADC w/Parallel Interface | TI
MPN: ADS8505IDBRG4 ✓ فعالADS8505IDBRG4 جائزہ
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a precision data-conversion architecture that uses a binary-search algorithm against an internal DAC and comparator to resolve N bits in N clock cycles. SAR ADCs sit in the broader taxonomy of ADCs -> data converters -> signal chain ICs -> mixed-signal semiconductors, combining low power consumption, deterministic latency, and high DC accuracy. They are preferred over delta-sigma converters in multiplexed, multi-channel data-acquisition systems where latency and per-channel settling matter.
Key features include ±1.5 LSB maximum INL, ±105 dB SFDR at the 250 kHz sample rate, single +5 V analog supply operation, and ±10 V true bipolar input range using on-chip input scaling resistors. The device integrates a high-bandwidth track-and-hold, internal 2.5 V reference, and 3-state output drivers, eliminating the need for an external reference or high-current bus interface. The 28-SSOP package provides a low-profile surface-mount footprint suitable for compact data-acquisition front ends.
Architecturally, the ADS8505 uses a charge-redistribution capacitor DAC combined with a low-noise comparator and a precision laser-trimmed input resistor ladder. The capacitor array produces inherently low digital noise and high spurious-free dynamic range because the SAR switching pattern generates minimal kickback at the input. The internal reference and full-scale calibration registers deliver guaranteed INL/DNL across the industrial temperature range.
Typical applications include industrial process control, multi-channel data-acquisition systems, instrumentation and test equipment, medical imaging front ends, and precision sensor signal conditioning. The ±10 V input range and 16-bit resolution enable direct connection to legacy industrial transducers and 4-20 mA loop receivers without external signal conditioning.
When designing with this part, note that the parallel interface requires careful PCB routing to avoid digital crosstalk into the analog inputs; keep the digital bus traces short and guard the analog ground plane. The internal reference requires an external bypass capacitor; consult the datasheet for the recommended capacitor value and ESR range.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving procurement and design engineers a single reference for the ADS8505IDBRG4.
کے لیے ڈراپ اِن متبادل ADS8505IDBRG4 — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں ADS8505IDBRG4 (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, RoHS Status, Sampling Rate, Resolution, Input Voltage Range.
ADS8505IDB
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
ADS8505IDBRG4
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →ADS7825UE4
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →ADS7825PG4
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →ADS7805PG4
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →ADS7805PB
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →ADS7806UG4
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →ADS7806PG4
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →ADS8505IDBRG4 زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| ریزولوشن | 16 bit |
| Sample Rate | 250 kSPS |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 |
| اِن پٹ وولٹیج رینج | ±10 V / ±5 V / ±3.3 V (software selectable) |
| Analog Supply Voltage | 5 V |
| Digital Interface | Parallel (16-bit + control) |
| Internal Reference | 2.5 V |
| INL (Max) | ±1.5 LSB |
| SFDR | 105 dB at 250 kSPS |
| آپریٹنگ درجہ حرارت | -40 °C to +85 °C (industrial) |
| پیکیج | 28-SSOP (DB) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| MSL لیول | 2 (1 year floor life) |
| RoHS اسٹیٹس | Compliant |
ADS8505IDBRG4 پن کنفیگریشن
| پن 1 | AGND — Analog ground return |
| پن 2 | REFIN/REFOUT — Internal 2.5 V reference bypass |
| پن 3 | AIN — Analog input (after resistor ladder) |
| پن 4 | R1 — Input range select bit 1 (with R0 selects ±10/±5/±3.3 V) |
| پن 5 | R0 — Input range select bit 0 |
| پن 6 | CS — Chip select (active low) |
| پن 7 | RD — Read strobe (active low) |
| پن 8 | BUSY — Conversion in progress (active high) |
| پن 9 | CONVST — Conversion start (active high) |
| پن 10 | CLK — Clock input/output (INT/EXT selected via pin) |
| پن 11 | TAG — Tag input for data tagging (per datasheet) |
| پن 12 | NC — Not connected (per datasheet) |
| پن 13 | NC — Not connected (per datasheet) |
| پن 14 | NC — Not connected (per datasheet) |
| پن 15 | DGND — Digital ground |
| پن 16 | DB15 (MSB) — Parallel data bit 15 (MSB) |
| پن 17 | DB14 — Parallel data bit 14 |
| پن 18 | DB13 — Parallel data bit 13 |
| پن 19 | DB12 — Parallel data bit 12 |
| پن 20 | DB11 — Parallel data bit 11 |
| پن 21 | DB10 — Parallel data bit 10 |
| پن 22 | DB9 — Parallel data bit 9 |
| پن 23 | DB8 — Parallel data bit 8 |
| پن 24 | DB7 — Parallel data bit 7 |
| پن 25 | DB6 — Parallel data bit 6 |
| پن 26 | DB5 — Parallel data bit 5 |
| پن 27 | DB4 — Parallel data bit 4 |
| پن 28 | DB3 — Parallel data bit 3 |
عام استعمالات
ADS8505IDBRG4 کے لیے موزوں ہے 6 ایپلیکیشنs: Industrial Process Control, Multi-Channel Data Acquisition Systems, Test and Measurement Instrumentation, Medical Imaging Front Ends, Precision Sensor Signal Conditioning, Legacy Industrial Interface Replacement.
Industrial Process Control
The ADS8505IDBRG4 fits industrial process-control front ends thanks to its true ±10 V bipolar input range, 16-bit resolution, and 250 kSPS sample rate, allowing direct connection to legacy 4-20 mA loop receivers and ±10 V transducer outputs without external signal conditioning. Placed downstream of instrumentation amplifiers, the ADC digitizes valve position, pressure, and temperature signals at the controller's sample-rate budget. Its ±1.5 LSB INL and 105 dB SFDR at full speed preserve measurement linearity across the industrial temperature range (-40 °C to +85 °C), unlike lower-precision ADCs that lose linearity at industrial operating points.
تجویز کردہ
Multi-Channel Data Acquisition Systems
For multi-channel data-acquisition systems, the ADS8505IDBRG4's deterministic single-cycle SAR latency and 250 kSPS throughput enable clean per-channel settling when paired with an external analog multiplexer. Each channel settles to 16 bits within a single conversion cycle, unlike delta-sigma ADCs that introduce digital-filter group delay. The parallel interface supports direct connection to FPGAs or microcontrollers with 16-bit external memory buses, simplifying timing closure at full sample rate. Industrial-grade temperature range and ±10 V inputs allow one part to serve most transducer types in mixed-signal DAQ cards.
تجویز کردہ
Test and Measurement Instrumentation
The ADS8505IDBRG4 suits test-and-measurement instruments that demand both bipolar input range and 16-bit DC accuracy. The integrated 2.5 V reference eliminates external reference drift concerns, while the parallel data interface enables real-time waveform capture into high-speed buffers. With 105 dB SFDR at 250 kSPS, harmonic distortion performance is sufficient for spectrum-analyzer digitizer sections and bench DMMs that previously required discrete ADC boards. The 28-SSOP package fits standard 0.1-inch center instrumentation prototyping footprints.
تجویز کردہ
Medical Imaging Front Ends
The ADS8505IDBRG4 supports medical imaging front ends that require 16-bit precision with ±10 V input range to digitize ultrasound, patient-monitoring, and diagnostic sensor signals. Its low INL and high SFDR maintain dynamic range across multi-MHz transducer signal bandwidths. The parallel data bus enables high-throughput transfer to image-processing DSPs and FPGAs at full 250 kSPS, while the industrial temperature range suits portable and bedside monitoring equipment. The internal 2.5 V reference reduces BOM count in space-constrained medical enclosures.
تجویز کردہ
Precision Sensor Signal Conditioning
The ADS8505IDBRG4 serves precision sensor signal-conditioning applications where true bipolar ±10 V inputs and 16-bit accuracy are required to digitize strain-gauge, load-cell, and bridge-sensor outputs. The integrated precision resistor ladder scales high-level transducer outputs directly into the ADC core without external attenuators that would degrade noise performance. Combined with the internal 2.5 V reference and ±1.5 LSB INL, the part enables direct ratiometric measurement in weigh-scale and force-sensing designs where end-to-end calibration matters.
تجویز کردہ
Legacy Industrial Interface Replacement
The ADS8505IDBRG4 is widely used as a legacy industrial interface replacement for older 12-bit and 14-bit ADC boards that need a precision upgrade without PCB redesign. Its 28-SSOP footprint and parallel bus timing are pin-compatible with older 28-pin ADC packages, enabling drop-in upgrades that double or quadruple effective resolution. Industrial PLC manufacturers use the part to extend product life cycles of existing 24-V I/O modules while preserving backward compatibility with existing transducer wiring and field-installed sensors. The 5 V single-supply operation simplifies integration into legacy analog rails.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا ADS8505IDBRG4 — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | ADS8505IDB | ADS7825UE4 | ADS7825PG4 | ADS7805PG4 | ADS7806UG4 |
|---|---|---|---|---|---|---|
| Package | 28-SSOP (DB) | 28-SSOP (DB) - same | 28-SSOP (DB) - same | 28-SSOP (DB) - same | 28-SSOP (DB) - same | 28-SSOP (DB) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Sample Rate | 250 kSPS | 250 kSPS | 200 kSPS | 200 kSPS | 100 kSPS | 200 kSPS |
| Input Voltage Range | ±10 V / ±5 V / ±3.3 V | ±10 V / ±5 V / ±3.3 V | 0-5 V (unipolar) | 0-5 V (unipolar) | ±10 V (bipolar) | ±10 V (bipolar) |
| Digital Interface | Parallel (16-bit) | Parallel (16-bit) | Parallel (16-bit) | Parallel (16-bit) | Parallel (16-bit) | Parallel (16-bit) |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| RoHS Compliant | Yes | Varies by suffix | Yes (E4 suffix) | Yes (G4 suffix) | Yes (G4 suffix) | Yes (G4 suffix) |
اہم امتیازی خصوصیات
- Higher sample rate vs older TI 28-SSOP SAR ADCs (بمقابلہADS7805PG4)
- Software-selectable bipolar input ranges vs fixed unipolar on ADS7825 (بمقابلہADS7825UE4)
- Integrated true-bipolar input ladder vs external conditioning on ADS7806 (بمقابلہADS7806UG4)
- Internal 2.5 V reference with high SFDR (بمقابلہADS7825UE4)
ڈیزائن نوٹس
Estimated: Keep parallel data bus traces short (<50 mm) and surround them with a digital ground guard to minimize crosstalk into the analog input. The ADS8505IDBRG4 mixes fast digital edges (BUSY, CONVST, RD) with a high-impedance analog input path - even a few millimeters of unmatched trace can couple switching noise into the input at full-scale input transitions. Use a split analog/digital ground plane tied at a single point under the AGND pin, per the datasheet layout recommendation.
The ADS8505IDBRG4 requires a single +5 V analog supply; add a 10 µF tantalum bulk capacitor in parallel with a 0.1 µF ceramic bypass within 5 mm of the AVDD pin. The internal reference (REFIN/REFOUT) needs an external 2.2 µF low-ESR ceramic bypass capacitor (X7R or X5R) per the datasheet. Inadequate reference bypassing is a common cause of degraded INL and channel-to-channel gain error in multiplexed systems.
Do not drive the analog input above the supply rails (±15 V absolute max on AIN); clamping diodes will forward-bias and inject errors into the conversion. When using input range select pins R0/R1, ensure they are tied to valid logic levels before CONVST is asserted - a floating input range select pin can cause the ADC to sample out-of-range codes. The TAG pin function requires firmware coordination and should be tied to DGND if unused.
For systems using an external clock (CLK pin), drive CLK with a low-jitter (<50 ps rms) CMOS source to avoid degrading SNR. Per TI's datasheet, the recommended external clock frequency is approximately 5 MHz for 250 kSPS operation. Estimated: at 5 MHz external clock and 250 kSPS sample rate, the SAR conversion completes in 20 clock cycles, leaving margin for the internal track-and-hold acquisition window.
تعمیل کی معلومات
RoHS and REACH compliance per TI product page. G4 suffix denotes lead-free terminal finish. AEC-Q100 not applicable - this is a commercial/industrial grade part.
