ADS7841PBG4 - 12-Bit 4-Ch 200kHz SAR ADC | Texas Instruments
MPN: ADS7841PBG4 ✓ فعالADS7841PBG4 جائزہ
A SAR ADC is a type of data converter that uses a binary-search successive-approximation algorithm to digitize an analog input in N clock cycles for N bits of resolution. SAR ADCs sit in the broader data-converter hierarchy of analog-to-digital converters, which also include delta-sigma, pipeline, and flash architectures. Within TI's portfolio, SAR ADCs are the workhorse choice for medium-speed (10 kSPS to 1 MSPS), medium-resolution (8 to 16 bit) multiplexed applications where low latency, deterministic throughput, and simple SPI/QSPI/MICROWIRE-compatible serial interfaces are required.
Key features of the ADS7841 include single +2.7V to +5.5V supply operation, a software-controlled shutdown mode that drops supply current to under 1 uA, an analog input range of 0V to VREF, and a reference voltage (VREF) that can be varied from 100 mV to VCC. The four analog inputs are selected by a 2-bit address and a 1-bit single-ended/differential control word clocked into the DIN pin, making the part pin-compatible with industry-standard touch-screen controllers of the same era. The 16-PDIP package supports breadboard and through-hole prototyping as well as legacy industrial backplanes.
Typical applications include industrial process control, portable data acquisition, isolated sensor front ends, pen/touch input replacement, and battery-powered instrumentation. The wide supply range and 1 uA shutdown current also make the part suitable for power-constrained remote-sensor nodes where the ADC is duty-cycled awake only when a measurement is needed.
When designing with the ADS7841PBG4, decouple VCC with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin, and bypass VREF with at least 1 uF of effective capacitance to keep the reference stable across conversions. The serial clock (DCLK) frequency is limited to 2.048 MHz at VCC = 5V (derate to 1.2 MHz at 2.7V) - the host MCU must respect this ceiling for reliable conversions. CS must be brought high after the 24th SCLK to complete the conversion cycle; floating CS mid-frame yields a corrupted sample. This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet to help engineers select, source, and integrate the ADS7841PBG4 with confidence.
کے لیے ڈراپ اِن متبادل ADS7841PBG4 — 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 ADS7841PBG4 (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Sampling Rate, Input Type, Resolution, Operating Temperature.
ADS7841P
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →ADS7841PB
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہ📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
ADS7841-Q1
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
ADS7841EG4
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
ADS7841E/2K5G4
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →ADS7841PBG4 زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| ریزولوشن | 12 bits (programmable to 8 bits) |
| Number of Input Channels | 4 single-ended or 2 differential |
| Architecture | SAR (Successive Approximation) |
| سیمپلنگ ریٹ | 200 kSPS |
| Conversion Time | 3.75 us |
| Data Interface | Serial (SPI/QSPI/MICROWIRE-compatible) |
| INL (Max) | +/-1 LSB |
| DNL (Max) | +/-1 LSB |
| SINAD | 72 dB |
| Missing Codes | None (guaranteed) |
| سپلائی وولٹیج | 2.7 V to 5.5 V (single supply) |
| Reference Voltage (VREF) | 100 mV to VCC |
| Analog Input Range | 0 V to VREF |
| Power Dissipation (Typ, 200 kHz, VCC=5V) | 2 mW |
| شٹ ڈاؤن کرنٹ | < 1 uA |
| آپریٹنگ درجہ حرارت | -40 C to +85 C (industrial) |
| پیکیج | 16-PDIP (0.300 in, 7.62 mm) |
| ماؤنٹنگ ٹائپ | Through-Hole |
| MSL لیول | 1 (unlimited) |
| RoHS اسٹیٹس | Compliant |
| Lead-Free | Yes |
ADS7841PBG4 پن کنفیگریشن
| پن 1 | VCC — Analog +2.7V to +5.5V supply |
| پن 2 | AIN0 — Analog input channel 0 |
| پن 3 | AIN1 — Analog input channel 1 |
| پن 4 | AIN2 — Analog input channel 2 |
| پن 5 | AIN3 — Analog input channel 3 |
| پن 6 | COM — Common reference for single-ended conversions |
| پن 7 | VREF — Reference voltage input (100 mV to VCC) |
| پن 8 | AGND — Analog ground |
| پن 9 | DGND — Digital ground |
| پن 10 | SHDN — Shutdown control (active low, tie high for normal operation) |
| پن 11 | DOUT — Serial data output |
| پن 12 | DIN — Serial data input (channel select) |
| پن 13 | CS — Chip select (active low) |
| پن 14 | DCLK — Serial data clock |
| پن 15 | BUSY — Conversion-in-progress output (active high) |
| پن 16 | VCC — Digital +2.7V to +5.5V supply (tied to pin 1) |
عام استعمالات
ADS7841PBG4 کے لیے موزوں ہے 6 ایپلیکیشنs: Industrial Process Control Multi-Sensor Acquisition, Portable Battery-Powered Data Acquisition, Legacy Touch-Screen Controller Replacement, Isolated Multi-Channel Sensor Front End, Test and Measurement Instrumentation, Pen-Digitizer and Graphics Tablet Input.
Industrial Process Control Multi-Sensor Acquisition
The ADS7841PBG4's 4-channel single-ended or 2-channel differential input multiplexer makes it a strong fit for industrial process control front ends where multiple sensors (temperature, pressure, flow, level) must be sampled from a single ADC. Its 200 kSPS throughput is well matched to multiplexed multi-sensor loops that need 1-10 kHz per-channel update rates. The 72 dB SINAD and +/-1 LSB INL/DNL deliver the linearity required for closed-loop control. Placed downstream of a 4-20 mA loop receiver or a thermocouple/RTD signal conditioner, the part provides the channel density and accuracy PLC and SCADA systems require.
تجویز کردہ
Portable Battery-Powered Data Acquisition
The ADS7841PBG4's 2 mW typical power dissipation at 200 kHz and sub-1 uA shutdown current suit battery-powered portable data acquisition loggers. The 2.7V-5.5V single-supply range is compatible with 2-3 cell alkaline, 1-2 cell Li-Ion, or 3.3V system rails. The serial interface (SPI/QSPI/MICROWIRE) interfaces directly to low-power MCUs like MSP430 or STM32L. For remote sensor nodes, the host can duty-cycle the ADC awake for short measurement bursts and return it to shutdown mode, stretching battery life across multi-year deployments.
تجویز کردہ
Legacy Touch-Screen Controller Replacement
The ADS7841PBG4 was originally designed as a 4-wire resistive touch-screen controller and remains pin-compatible with that legacy interface. Its 4 single-ended analog inputs connect to the X+, X-, Y+, Y- touch-panel signals, and its 12-bit resolution delivers approximately 0.025% of full-scale touch-position accuracy - adequate for industrial HMI and POS terminals. The synchronous serial interface is identical to legacy touch-screen controllers, so firmware rarely needs modification. Industrial -40C to +85C operation supports outdoor and factory-floor HMI panels.
تجویز کردہ
Isolated Multi-Channel Sensor Front End
The ADS7841PBG4's 4-channel mux combined with low 2 mW dissipation simplifies isolated front-end design: drive the ADC from the isolated side and route the digital serial interface across an optocoupler or digital isolator. Each of the four inputs can connect to a different isolated sensor (current shunt, thermocouple, RTD bridge), and a single isolation barrier serves all four channels, reducing BOM cost. The 2.7V-5.5V supply is compatible with isolated 5V or 3.3V rails generated from small isolated DC-DC modules. The serial interface is inherently low-EMI, simplifying isolation barrier design.
تجویز کردہ
Test and Measurement Instrumentation
The ADS7841PBG4's 12-bit resolution with pin-programmable 8-bit mode and 200 kSPS throughput fits bench-top test and measurement instruments that need fast, accurate multi-channel acquisition. The 8-bit mode is useful for high-speed scope-like digitizers where 1 MSPS effective aggregate throughput across 4 channels is desired, while 12-bit mode delivers precision for DMM and LCR meter front ends. The 16-PDIP through-hole package is ideal for hand-built prototypes and small-batch lab instruments. The synchronous serial interface simplifies connection to FPGAs and high-speed DSPs.
تجویز کردہ
Pen-Digitizer and Graphics Tablet Input
The ADS7841PBG4 was originally designed for pen-digitizer and graphics-tablet applications, with its 4 single-ended input channels connecting to the X-plate, Y-plate, and pressure-sensor signals of an EMR pen system. Its 200 kSPS sampling rate supports real-time pen tracking at 100-200 points per second, and its 12-bit resolution gives approximately 4096 x 4096 coordinate resolution across a standard A4 digitizing surface. The synchronous serial interface connects to the host MCU with minimal GPIO, and the 1 uA shutdown mode extends battery life in wireless pen tablets.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا ADS7841PBG4 — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | ADS7841P | ADS7841PB | ADS7841-Q1 | ADS7841EG4 | ADS7841E/2K5G4 |
|---|---|---|---|---|---|---|
| Package | 16-PDIP (through-hole) | 16-PDIP - same | 16-PDIP - same | 16-PDIP - same | 16-SSOP (SMT) | 16-SSOP (SMT) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12 bits (8-bit programmable) | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS |
| Input Channels | 4 SE / 2 DIFF | 4 SE / 2 DIFF | 4 SE / 2 DIFF | 4 SE / 2 DIFF | 4 SE / 2 DIFF | 4 SE / 2 DIFF |
| Supply Voltage | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V |
| Temperature Range | -40C to +85C (industrial) | 0C to +70C (commercial) | 0C to +70C (commercial) | -40C to +125C (automotive) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| Automotive Grade (AEC-Q100) | No | No | No | Yes | No | No |
| Power Dissipation (Typ) | 2 mW | 2 mW | 2 mW | 2 mW | 2 mW | 2 mW |
اہم امتیازی خصوصیات
- Through-hole 16-PDIP package for legacy and breadboard designs (بمقابلہADS7841EG4 (16-SSOP surface-mount))
- Industrial temperature range -40C to +85C (بمقابلہADS7841P (commercial 0C to +70C))
- Programmable 8-bit or 12-bit resolution (بمقابلہFixed-resolution 12-bit SAR ADCs)
- Sub-1 uA shutdown current for battery-powered duty-cycled operation (بمقابلہADS1110 (continuous-conversion 16-bit delta-sigma))
ڈیزائن نوٹس
Decouple VCC (pins 1 and 16) with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pins, plus a bulk 1-10 uF tantalum or ceramic capacitor on the same rail. The ADS7841PBG4 draws brief current spikes during SAR conversion, and insufficient decoupling causes reference sag that degrades linearity. For lowest noise, use a separate analog LDO (e.g., TPS7A4533) for the ADS7841 VCC rather than sharing the digital 3.3V or 5V rail directly with the host MCU.
Route analog signals (AIN0-AIN3, COM, VREF) and digital signals (DCLK, DIN, DOUT, CS, BUSY) on opposite sides of the package to minimize digital-to-analog crosstalk. Place the AGND and DGND pins on a single low-impedance ground plane, with a star-ground connection at the ADC's AGND pin. Keep the DCLK trace short and route it away from the analog inputs; clock edges couple into the sample-and-hold and degrade SNR if the trace is long or parallel to analog traces.
The DCLK frequency is limited to 2.048 MHz at VCC = 5V and 1.2 MHz at VCC = 2.7V. Exceeding these limits yields corrupted conversion results because the internal SAR timing margin is violated. CS must be brought high after the 24th SCLK falling edge to complete the conversion; if CS is left low, the BUSY signal stays asserted and no new conversion is initiated. According to the TI datasheet, the part requires 24 DCLK cycles per conversion in 12-bit mode and 16 DCLK cycles in 8-bit mode.
Do not operate the ADS7841PBG4 below VREF < 100 mV or above VREF = VCC - the input multiplexer and reference buffer are not specified outside this range. The SHDN pin must be tied high (or driven by a GPIO) for normal operation; floating SHDN puts the part in an indeterminate state. The BUSY signal is open-drain on some revisions and push-pull on others - check your silicon revision and use the appropriate pull-up if needed. The COM pin must be connected to the low-side of the signal source for single-ended conversions; leaving it floating introduces large gain errors.
تعمیل کی معلومات
RoHS compliant and lead-free per TI product page. The PBG4 (industrial) is not AEC-Q100 qualified; choose ADS7841-Q1 for automotive applications. Halogen-free status not explicitly stated in available data.
