HI5812JIB - 12-Bit 20us SAR ADC with T/H | Renesas
MPN: HI5812JIB ✓ Hoạt độngHI5812JIB Tóm tắt
An ADC (analog-to-digital converter) is an integrated circuit that converts a continuous analog voltage into a discrete digital code. Within the data-converter hierarchy, the HI5812JIB belongs to the SAR sub-family, which performs one conversion in N successive approximation steps using a single comparator and a switched-capacitor DAC. SAR ADCs are valued for their deterministic latency, low power consumption, and inherent sample-hold behavior, making them ideal for multiplexed multi-channel systems and DC as well as audio-bandwidth signals up to tens of kHz.
Key features of the HI5812JIB include 12-bit resolution with no missing codes, internal track-and-hold, single +3V to +6V supply operation, low 1.9 mA typical supply current, 20-microsecond typical conversion time, a parallel output bus, and three-state output buffers for direct bus interfacing. The 24-SOIC package is industry-standard and compatible with automated surface-mount assembly, easing manufacturing integration.
Architecturally, the HI5812JIB combines a high-impedance CMOS input stage, a charge-redistribution DAC array, a low-noise comparator, and a SAR control logic block. The internal track-and-hold eliminates the need for an external sample-and-hold amplifier in most applications and defines a 2 MHz full-power bandwidth. The part supports both unipolar (0-VREF to VREF) and bipolar (-VREF to VREF) input ranges when VREF is tied to a clean reference such as 2.5V or 5V.
Typical applications include process control and industrial automation data-acquisition boards, portable and battery-powered instrumentation, multiplexed data-logging systems, and digital signal-processor front-ends. Designers value the HI5812JIB for its small footprint, single-supply operation, and predictable SAR behavior in real-time control loops.
When designing with this ADC, place a 0.1 uF decoupling capacitor as close as possible to the VDD pin and ensure a low-impedance ground return to preserve linearity. Drive the analog input with a low-output-impedance buffer because the internal T/H settling time directly limits acquisition accuracy at high source impedances.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the standalone manufacturer datasheet, giving engineers a single source for sourcing, substitution, and design guidance.
Bộ thay thế dễ dàng lắp đặt cho HI5812JIB — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với HI5812JIB (cùng hình factor và footprint) — khác nhau ở Architecture, Conversion Time, Operating Temperature, Package, Resolution.
HI5812JIB-T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
HI5812KIB
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD7896JRZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7858BRZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1247AEEE
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
HI5812JIB Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Converter Type | SAR (Successive Approximation Register) |
| Number of Input Channels | 1 |
| Conversion Time | 20 us (typical) |
| Supply Voltage (VDD) | 3 V to 6 V |
| Supply Current (Operating) | 1.9 mA (typical) |
| Analog Input Range | 0 V to VREF (unipolar) or -VREF to +VREF (bipolar) |
| Internal Track and Hold | Yes (integrated) |
| Full-Power Input Bandwidth | 2 MHz (typical) |
| Output Interface | Parallel (12-bit, three-state) |
| Hộp | 24-pin SOIC (300 mil) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +85C (industrial) |
| Architecture | CMOS, charge-redistribution DAC |
| Trạng thái RoHS | Compliant |
Cấu hình chân HI5812JIB
| Chân 1 | VIN — Analog input |
| Chân 2 | AGND — Analog ground |
| Chân 3 | VREF — Reference voltage input |
| Chân 4 | VDD — Positive supply (3V to 6V) |
| Chân 5 | CLK — Clock input (or internal oscillator) |
| Chân 6 | CONVST — Conversion start input |
| Chân 7 | OE — Output enable (active high, three-state) |
| Chân 8 | D0 — Data bit 0 (LSB) |
| Chân 9 | D1 — Data bit 1 |
| Chân 10 | D2 — Data bit 2 |
| Chân 11 | D3 — Data bit 3 |
| Chân 12 | DGND — Digital ground |
| Chân 13 | D4 — Data bit 4 |
| Chân 14 | D5 — Data bit 5 |
| Chân 15 | D6 — Data bit 6 |
| Chân 16 | D7 — Data bit 7 |
| Chân 17 | D8 — Data bit 8 |
| Chân 18 | D9 — Data bit 9 |
| Chân 19 | D10 — Data bit 10 |
| Chân 20 | D11 — Data bit 11 (MSB) |
| Chân 21 | NC — Not connected (per datasheet) |
| Chân 22 | NC — Not connected (per datasheet) |
| Chân 23 | NC — Not connected (per datasheet) |
| Chân 24 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
HI5812JIB phù hợp cho 6 Áp dụngs: Process Control Data Acquisition, Portable Battery-Powered Instrumentation, Multiplexed Data Logging System, DSP Front-End Data Conversion, Industrial Automation Sensor Readout, Audio-Bandwidth Signal Sampling.
Process Control Data Acquisition
The HI5812JIB's 12-bit resolution, 20 us conversion, and single 3V to 6V supply make it well suited for industrial process-control data-acquisition boards that monitor 4-20 mA loops, thermocouples, and pressure transducers. Its SAR architecture delivers deterministic single-cycle conversion latency, which is critical for real-time PID control loops that need to read a sensor and update an actuator within the same control period. The integrated track-and-hold eliminates the need for an external SHA, reducing BOM cost. The 1.9 mA typical supply current allows the ADC to share a regulated analog rail with other front-end components without loading the LDO. Designers typically pair it with an instrumentation amplifier such as AD620 and a 2.5V or 5V reference to achieve 12-bit no-missing-codes performance across the -40C to +85C industrial temperature range.
Được đề xuất
Portable Battery-Powered Instrumentation
The HI5812JIB draws only 1.9 mA typical supply current from a single 3V to 6V rail, which is critical for portable and battery-powered instruments such as handheld multimeters, field data loggers, and medical monitoring devices. The 20 us conversion time keeps the duty cycle low during periodic sampling, allowing the host MCU to duty-cycle the ADC power and stretch battery life. The 24-SOIC package occupies about 0.6 inch of board length, fitting inside compact handheld enclosures. The internal track-and-hold removes the need for an external SHA, reducing total quiescent current by 2-3 mA. Pair the part with a low-power MCU such as MSP430 or PIC18 to keep total system sleep current under 100 uA between samples.
Được đề xuất
Multiplexed Data Logging System
The HI5812JIB's 20 us conversion time and 2 MHz full-power input bandwidth let it settle quickly when switched between channels in a multiplexed data-acquisition system. Although the part has a single input channel, designers can use an external analog mux such as ADG708 or CD74HC4051 to fan out 8 or 16 sensor inputs to the ADC. The integrated track-and-hold captures the input within the first half of the conversion cycle, so channel-to-channel settling is dominated by the mux and buffer bandwidth rather than the ADC. The 12-bit no-missing-codes performance preserves 0.024 percent accuracy across the input range. This makes the HI5812JIB a good fit for environmental monitors, energy-management systems, and multi-sensor test fixtures.
Được đề xuất
DSP Front-End Data Conversion
The HI5812JIB's parallel 12-bit digital interface and deterministic SAR latency make it a good match for digital-signal-processor (DSP) and microcontroller front-ends that need to feed digitized data into a real-time processing pipeline. The 20 us conversion time corresponds to about 40 kSPS, well within the bandwidth of speech-bandwidth DSPs and motor-control loops. The three-state output buffers allow direct bus sharing with memory and other peripherals on a single MCU data bus. The internal track-and-hold removes the need for an external SHA, simplifying PCB layout. Designers typically connect the parallel outputs directly to the lower 12 bits of the MCU data bus and use a single read strobe to latch the conversion result.
Được đề xuất
Industrial Automation Sensor Readout
The HI5812JIB operates across -40C to +85C industrial temperature range from a single 3V to 6V supply, with 12-bit no-missing-codes performance, making it well suited for industrial automation sensor readout modules. The SAR architecture provides single-cycle deterministic conversion, essential for closed-loop control applications such as valve positioning, motor speed sensing, and hydraulic pressure monitoring. The 24-SOIC package supports reflow soldering in high-volume manufacturing lines. The 1.9 mA typical supply current is modest enough to share a regulated analog rail with other sensors. The 2 MHz full-power input bandwidth captures fast transient events on factory-floor sensors before they alias into lower frequencies.
Được đề xuất
Audio-Bandwidth Signal Sampling
The HI5812JIB's 2 MHz full-power input bandwidth and 20 us conversion time support sampling of audio-bandwidth signals up to approximately 20 kHz with 12-bit resolution. The SAR architecture avoids the group delay of sigma-delta digital filters, preserving phase relationships for speech-bandwidth DSP algorithms. The single 3V to 6V supply operation lets the ADC share rails with audio op-amps and codec ICs in mixed-signal designs. The integrated track-and-hold captures fast transients on the analog input without external SHA, reducing BOM. The 24-SOIC footprint is compatible with standard audio daughter-card layouts. Pair the part with a low-noise audio op-amp such as OPA2134 and a 4.096V reference for best linearity on 12-bit audio signals.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho HI5812JIB — 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 | HI5812JIB-T | HI5812KIB | AD7896JRZ | AD7858BRZ | MAX1247AEEE |
|---|---|---|---|---|---|---|
| Package | 24-SOIC (300 mil) | 24-SOIC - same | 24-SOIC - same | 24-SOIC - same | 24-SOIC - same | 24-SOIC - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Analog Devices | Analog Devices | Maxim Integrated |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Input Channels | 1 | 1 | 1 | 1 | 8 | 4 |
| Output Interface | Parallel 12-bit | Parallel 12-bit | Parallel 12-bit | Serial 12-bit | Serial/Parallel 12-bit | Serial 12-bit |
| Operating Temperature | -40C to +85C | -40C to +85C | 0C to +70C | -40C to +85C | -40C to +85C | -40C to +85C |
Bảo phân biệt quan trọng
- Lowest supply current in a 24-SOIC 12-bit SAR (vsAD7896JRZ)
- Integrated track-and-hold eliminates external SHA (vsAD7858BRZ)
- Single 3V to 6V supply operation (vsMAX1247AEEE)
Ghi chú thiết kế
Place a 0.1 uF X7R ceramic decoupling capacitor as close as possible (within 3 mm) to the VDD pin, with a wider-trace ground return to the analog ground plane. Add a 10 uF bulk tantalum or ceramic capacitor on the same rail near the ADC. The HI5812JIB's 1.9 mA typical supply current is small, but fast transient current spikes during conversion switching can inject 5-10 mA peaks; a low-impedance local decoupling network keeps the rail within 50 mV of the nominal voltage during acquisition.
Drive the analog input with a low-output-impedance buffer (under 1 kohm) to ensure the internal track-and-hold settles within the acquisition window. The HI5812JIB's 2 MHz full-power input bandwidth implies a settling time of about 1 us for a full-scale step; high source impedance can stretch this to several microseconds and degrade linearity. Use an op-amp such as OP196 or AD8628 with a series 10 ohm isolation resistor and a 1 nF capacitor to filter high-frequency noise at the input pin.
Do not connect VREF to VDD without a buffer, as VDD noise directly couples into the reference and degrades 12-bit linearity by 1-2 LSB. Use a dedicated low-noise reference such as REF02 or REF1930, and bypass VREF with a 10 uF tantalum in parallel with a 0.1 uF ceramic. Keep digital return currents (D0-D11, CLK, OE) physically separate from the analog ground path to avoid digital switching noise coupling into the analog input. Use a single-point ground tie between analog and digital ground returns near the ADC.
Thông tin tuân thủ
RoHS and REACH compliant per Renesas product page. Not AEC-Q100 qualified - choose automotive-grade ADC for AEC-Q100 designs. Halogen-free status not confirmed in available data.
