TLV1508IDWRG4 - 10-Bit 200kSPS 8-Ch Serial ADC | Texas Instruments
MPN: TLV1508IDWRG4 ✓ Hoạt độngTLV1508IDWRG4 Tóm tắt
A successive-approximation register ADC is a type of analog-to-digital converter that uses a binary search algorithm against an internal precision DAC to resolve each input voltage in a fixed number of clock cycles. SAR ADCs sit in the broader hierarchy of analog-to-digital converters -> data converters -> signal-chain ICs -> mixed-signal semiconductors. Compared with delta-sigma ADCs, SAR parts offer deterministic latency and very low power consumption at moderate sample rates, which is why they dominate multiplexed multi-channel data-acquisition front ends.
Key specifications include 0.0488% maximum linearity error (DNL/INL), a true 200 kSPS throughput, hardware and software-configurable power-down to extend battery life, and an industrial -40C to +85C operating range. The device includes a built-in oscillator, sample-and-hold, and programmable auto-channel sequencing that cycles through 1 to 8 channels without host MCU intervention. Three digital input pins and a 3-state SDO output allow direct glueless connection to virtually any DSP, microcontroller, or FPGA.
Typical applications include multi-channel data acquisition, portable instrumentation, battery-powered sensor modules, factory automation analog front ends, and process control I/O. The wide supply range and ultra-low power-down current also make it attractive for handheld and remote-monitoring equipment. The internal channel sequencer is particularly valuable in cyclic-scanning systems where deterministic sample-to-channel mapping simplifies firmware.
Designers should observe careful analog input layout: keep analog traces short, place a small RC anti-alias filter ahead of each input channel, and ensure the AVDD supply is well-bypassed with both 0.1 uF and 10 uF capacitors close to the pin. The auto-power-down mode can be triggered by software after each conversion to drop supply current to the microampere range between scans, dramatically lowering average power in slow-scanning battery applications.
Bộ thay thế dễ dàng lắp đặt cho TLV1508IDWRG4 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
TLV1508IDW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TLV1508IDWR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TLV2548IDW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TLV1508IDWRG4 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 10 bit |
| Number of Input Channels | 4 / 8 (configurable) |
| Sample Rate (Throughput) | 200 kSPS |
| Conversion Time (max) | 3.86 us |
| Architecture | SAR (Successive Approximation) |
| Supply Voltage (AVDD/DVDD) | 2.7 V to 5.5 V |
| Analog Input Voltage Range | 0 V to AVDD (single-ended) |
| Maximum Linearity Error (DNL/INL) | 0.0488% (max) |
| Digital Interface | SPI / 4-wire serial (CS, SCLK, SDI, SDO) |
| Power-Down Modes | Hardware, software, and auto power-down |
| Auto Channel Sweep | Programmable, 1 to 8 channels |
| Khoảng nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Hộp | 20-pin SOIC (DW) - wide-body |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 (unlimited floor life) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân TLV1508IDWRG4
| Chân 1 | AVDD — Analog supply voltage |
| Chân 2 | REF — Reference voltage input (decoupled to AGND) |
| Chân 3 | AIN0 — Analog input channel 0 |
| Chân 4 | AIN1 — Analog input channel 1 |
| Chân 5 | AIN2 — Analog input channel 2 |
| Chân 6 | AIN3 — Analog input channel 3 |
| Chân 7 | AIN4 — Analog input channel 4 |
| Chân 8 | AIN5 — Analog input channel 5 |
| Chân 9 | AIN6 — Analog input channel 6 |
| Chân 10 | AIN7 — Analog input channel 7 |
| Chân 11 | AGND — Analog ground |
| Chân 12 | SCLK — Serial clock input |
| Chân 13 | SDI — Serial data input |
| Chân 14 | SDO — Serial data output (3-state) |
| Chân 15 | CS — Chip select (active low) |
| Chân 16 | EOC — End-of-conversion output |
| Chân 17 | DGND — Digital ground |
| Chân 18 | DVDD — Digital supply voltage |
| Chân 19 | INT — Interrupt / channel sweep output |
| Chân 20 | HWPD — Hardware power-down control input |
Ứng dụng tiêu biểu
TLV1508IDWRG4 phù hợp cho 6 Áp dụngs: Multi-Channel Data Acquisition Systems, Portable Battery-Powered Instrumentation, Factory Automation and Process Control I/O, Sensor Hubs and IoT Edge Nodes, Automotive and Off-Road Vehicle Sensor Monitoring, DSP and Microcontroller Peripheral Expansion.
Multi-Channel Data Acquisition Systems
The TLV1508IDWRG4 is engineered for multiplexed data-acquisition front ends where multiple analog sensors share a single ADC. With 8 single-ended input channels, 200 kSPS throughput, and a programmable auto-channel sweep, the TLV1508IDWRG4 scans temperature, pressure, strain-gauge, and 4-20 mA conditioned signals without host CPU intervention. The 0.0488% max linearity error (1 LSB at 10 bits) provides adequate resolution for industrial process variables, while the 3.86 us conversion time keeps total scan time under 35 us for all 8 channels. In a typical design, the host issues a single command and the device sequences through channels, raising an end-of-conversion flag for DMA transfer.
Được đề xuất
Portable Battery-Powered Instrumentation
Battery-powered handheld instruments benefit from the TLV1508IDWRG4's three power-down modes (hardware, software, and automatic). Between conversions the supply current drops into the microampere range, dramatically extending battery life in intermittent-sampling applications such as digital multimeters, portable gas detectors, and field data loggers. Operating from a single 2.7 V to 5.5 V supply, the part runs directly from 2xAA alkaline or single Li-ion cells without a boost converter. Combined with the 8-channel scan capability, a single TLV1508IDWRG4 can replace multiple discrete ADCs, reducing BOM cost and PCB area.
Được đề xuất
Factory Automation and Process Control I/O
Programmable Logic Controllers (PLCs), distributed I/O modules, and industrial sensor hubs require rugged, multi-channel ADC interfaces with deterministic latency. The TLV1508IDWRG4's SAR architecture guarantees fixed 3.86 us conversion time regardless of input magnitude, simplifying synchronous control-loop timing. The -40C to +85C industrial temperature range, 5.5 V supply tolerance, and 0 V-AVDD input range cover 4-20 mA current-loop receivers, RTD bridge outputs, and 0-10 V industrial transducers after signal conditioning. Its 4-wire SPI bus glues directly to host PLC processors and remote I/O field-bridge ASICs.
Được đề xuất
Sensor Hubs and IoT Edge Nodes
IoT edge devices and smart-sensor hubs typically aggregate multiple analog sensors (temperature, humidity, gas, light) behind a low-power MCU. The TLV1508IDWRG4's 8-channel scan and auto-power-down fit this use case precisely: the MCU sleeps between scans while the ADC autonomously cycles through sensors and wakes the host via an interrupt. Its 2.7 V minimum supply supports direct coin-cell or energy-harvested rails. Combined with a low-power wireless MCU such as the CC2640 or MSP430, the part enables multi-year battery life in wireless sensor networks.
Được đề xuất
Automotive and Off-Road Vehicle Sensor Monitoring
Although the TLV1508IDWRG4 itself is not AEC-Q100 qualified, the part's -40C to +85C industrial temperature range and 8-channel scan are useful for non-safety automotive subsystems: cabin HVAC sensors, battery-pack cell monitors, off-road vehicle telematics, and auxiliary body controllers. Designers needing AEC-Q100 must migrate to a Q1-graded alternative, but the TLV1508IDWRG4 covers non-critical vehicle-monitoring channels at a fraction of the cost of full automotive-grade parts.
Được đề xuất
DSP and Microcontroller Peripheral Expansion
Many DSPs and MCUs lack sufficient on-chip ADC channels for production designs. The TLV1508IDWRG4 adds 8 channels over a standard SPI bus, with the host CPU offloading channel sequencing to the ADC's hardware sweep engine. It pairs naturally with TI's Tiva C, MSP430, C2000, and Sitara families, as well as third-party Cortex-M devices. The 3-state SDO output allows multiple SPI peripherals to share a single bus segment, simplifying board routing in mixed-signal systems.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TLV1508IDWRG4 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | TLV1508IDW | TLV1508IDWR | TLV2548IDW |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 20-SOIC (DW) | 20-SOIC (DW) - same | 20-SOIC (DW) - same | 20-SOIC (DW) - same |
| Resolution | 10 bit | 10 bit | 10 bit | 12 bit |
| Sample Rate | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS |
| Input Channels | 4 / 8 | 4 / 8 | 4 / 8 | 8 |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Conversion Time | 3.86 us | 3.86 us | 3.86 us | 2.5 us typical |
| Auto Power-Down | Yes (HW/SW/Auto) | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Unit Price (qty 1) | $5.42 | $5.80 (tube) | $5.42 (tape & reel) | $7.20 |
Bảo phân biệt quan trọng
- 8 single-ended analog inputs with auto channel sweep (vsTLV2548IDW (12-bit))
- Triple-mode auto power-down for battery applications (vsTLV1504IDR (4-channel))
- Industrial -40C to +85C operating range (vsConsumer-grade SAR ADCs)
Ghi chú thiết kế
The TLV1508IDWRG4 draws microampere-level current in power-down mode but milliamps during active conversion. Decouple AVDD with a 0.1 uF ceramic placed within 5 mm of the pin, plus a 10 uF bulk capacitor. Tie AVDD and DVDD to the same supply rail; separate analog (AGND) and digital (DGND) ground planes must be joined at a single point beneath the IC to avoid ground-loop noise coupling into analog inputs.
Route analog input traces away from digital SPI clock and data lines. Use a ground guard ring on the analog input side and keep input traces as short as possible (under 25 mm where practical). Place a small anti-alias RC filter (typically 100 ohm + 1 nF) close to each AIN pin when measuring wide-bandwidth or noisy transducer signals.
The serial clock (SCLK) maximum frequency for the TLV1508 family is documented in the datasheet timing table. Ensure the host SPI peripheral does not exceed this rate, and place a small series resistor (22-33 ohm) near SCLK if the bus is longer than 50 mm to dampen ringing. The 3-state SDO output must be released by pulling CS high between transactions.
Common pitfalls: (1) Forgetting to issue a software power-up command after auto-power-down causes the next conversion to read as zero. (2) Driving AIN above AVDD damages the input ESD structure - clamp signals with back-to-back diodes if over-voltage is possible. (3) Leaving unused AIN pins floating allows crosstalk into active channels - tie unused AIN pins to mid-rail or AGND.
Thông tin tuân thủ
G4 suffix denotes lead-free / RoHS-compliant assembly per TI part-number convention. Not AEC-Q100 qualified; select an automotive-graded alternative for safety-critical vehicle applications. Halogen-free status not stated on verified sources.
