HI5812JIBZ - 12-Bit 50kSPS SAR ADC w/ Track & Hold | Renesas
MPN: HI5812JIBZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.88 | $48.80 |
| 100 | $4.05 | $405.00 |
| 500 | $3.62 | $1,810.00 |
| 1,000 | $3.18 | $3,180.00 |
HI5812JIBZ Overview
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 precision DAC to digitize an input voltage. SAR ADCs sit in the data-converter hierarchy between flash converters (fastest, lowest resolution) and sigma-delta converters (highest resolution, lowest speed). They deliver an excellent balance of speed, resolution, and power consumption for industrial, instrumentation, and process-control signal chains, and they guarantee no pipeline latency - a single conversion yields a complete 12-bit code.
Key features of the HI5812JIBZ include a 20-microsecond typical conversion time, 50 kSPS guaranteed throughput, an on-chip clock oscillator, and a hardware CONVERT_START input plus a DATA_READY flag to simplify handshake with microcontrollers and microprocessors. The high-impedance analog input is sample-and-held internally, removing the need for an external buffer on moderate source-impedance signals. The 24-SOIC wide-body footprint gives generous thermal headroom and simplifies hand-soldering during prototype rework.
The HI5812JIBZ is fabricated on a high-speed CMOS process with a precision thin-film ladder DAC. Its architecture ensures monotonic conversion and stable gain/offset over temperature, while the wide 24-SOIC package simplifies thermal management and PCB layout. Compared with discrete ADC + op-amp front ends, the integrated track-and-hold eliminates a full S/H stage BOM and reduces propagation uncertainty in multiplexed-channel systems.
Typical applications include industrial process-control signal acquisition, multi-channel data-logging front ends, portable and battery-powered instrumentation, sonar/radar signal conditioning, and digital audio front-end monitoring. Designers frequently pair it with external reference ICs, anti-alias RC filters, and a 74HC574 latch or 8-bit microcontroller for bus de-multiplexing.
When designing with this part, observe the recommended layout guidelines: keep analog and digital grounds separated and join them only at the AGND pin, decouple VDD and VREF with low-ESR ceramic capacitors placed within 5 mm of the supply pins, and provide a low-impedance reference such as the ADR01 or REF02 for full 12-bit absolute accuracy.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the original manufacturer datasheet and accelerate component selection.
Drop-in alternatives for HI5812JIBZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with HI5812JIBZ (same form factor and footprint) — differing in Architecture, Resolution, Conversion Time, Number of Channels, Data Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
HI5812JIBZ-T
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →HI5812KIBZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.05 / Unit
View Datasheet →ADS8505IDBRG4
✅ Drop-In✓ In Stock
$30.86 / Unit
View Datasheet →HI5812JIBZ Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit |
| Architecture | SAR (Successive Approximation) with internal Track-and-Hold |
| Number of Channels | 1 single-ended input |
| Sample Rate | 50 kSPS (max) |
| Conversion Time | 20 us (typical) |
| Input Voltage Range | 0 V to VREF (unipolar) |
| Integral Linearity Error (INL) | 1.5 LSB (max) |
| Analog Supply Voltage (VDD) | +5 V |
| Digital Interface | Parallel, user-selectable 12-bit / 8-bit MSB / 4-bit LSB |
| Output Type | Three-state CMOS, latched across one full conversion |
| Control Inputs/Outputs | CONVERT_START (input), DATA_READY (flag) |
| Internal Clock | On-chip oscillator |
| Power Dissipation | 25 mW |
| Operating Temperature Range | -40 C to +85 C |
| Package / Mounting | 24-pin SOIC (wide body), surface mount |
| Process Technology | High-speed CMOS with thin-film DAC |
| RoHS Status | Compliant |
HI5812JIBZ Pin Configuration
| Pin 1 | DVDD — +5 V digital supply |
| Pin 2 | DGND — Digital ground |
| Pin 3 | CONVERT_START — Active-high pulse initiates conversion |
| Pin 4 | DATA_READY — Active-low flag indicates conversion complete |
| Pin 5 | D11 (MSB) — Data bit 11 (MSB) |
| Pin 6 | D10 — Data bit 10 |
| Pin 7 | D9 — Data bit 9 |
| Pin 8 | D8 — Data bit 8 |
| Pin 9 | D7 — Data bit 7 |
| Pin 10 | D6 — Data bit 6 |
| Pin 11 | D5 — Data bit 5 |
| Pin 12 | D4 — Data bit 4 |
| Pin 13 | D3 — Data bit 3 |
| Pin 14 | D2 — Data bit 2 |
| Pin 15 | D1 — Data bit 1 |
| Pin 16 | D0 (LSB) — Data bit 0 (LSB) |
| Pin 17 | 8/12_SELECT — Select 8-bit (high) or 12-bit (low) bus mode |
| Pin 18 | OE — Output enable (three-state control) |
| Pin 19 | AGND — Analog ground |
| Pin 20 | AVDD — +5 V analog supply |
| Pin 21 | VREF — External reference voltage input |
| Pin 22 | AIN — Analog input (0 V to VREF) |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | NC — Not connected (per datasheet) |
Typical Applications
HI5812JIBZ is suitable for 6 applications: Industrial Process Control Signal Acquisition, Multichannel Data-Logging Front End, Portable Battery-Powered Instrumentation, Sonar and Radar Signal Conditioning, Digital Audio Front-End Monitoring, Embedded Sensor Interface for Microcontrollers.
Industrial Process Control Signal Acquisition
The HI5812JIBZ is well suited to industrial 4-20 mA / 0-10 V signal-chain front ends where deterministic single-cycle conversion matters. Its 12-bit resolution and 50 kSPS throughput are sufficient for closed-loop temperature, pressure, and flow monitoring with sample rates well above the Nyquist limit of typical process variables. The internal track-and-hold eliminates the need for an external buffer, reducing BOM and propagation uncertainty in multiplexed channels. Operate the part from a clean +5 V analog rail and a low-drift external reference (ADR01 or REF02) for full 12-bit absolute accuracy. Pair the parallel data bus with a microcontroller's 8-bit or 16-bit port for code-efficient reads.
Recommended
Multichannel Data-Logging Front End
For multi-channel data loggers sampling thermocouples, strain gauges, and analog sensors, the HI5812JIBZ's 0 V to VREF unipolar input simplifies the analog front end. The internal track-and-hold allows the system to multiplex several sensor channels through a 4051/4053-style switch and feed a single ADC without per-channel buffers. The hardware CONVERT_START input and DATA_READY flag make it easy to time conversions deterministically from a microcontroller, and the 12/8/4-bit user-selectable data format optimizes code-firmware reads. Choose a low-drift VREF for loggers used in field calibration, and add an anti-alias RC filter on AIN for clean sample captures.
Recommended
Portable Battery-Powered Instrumentation
The HI5812JIBZ draws only about 25 mW from a single +5 V rail, which is acceptable for portable instrumentation powered by 4xAA cells with an LDO regulator. The wide-body 24-SOIC package simplifies hand-assembly for low-volume test equipment, while the deterministic SAR conversion gives a known conversion latency that simplifies firmware state machines. For battery systems, power the ADC from a low-Iq LDO (TPS7A45xx family) and gate the supply with a load switch when the instrument is in standby to extend battery life. The 1.5 LSB max INL provides adequate accuracy for handheld DMM and field-meter applications.
Recommended
Sonar and Radar Signal Conditioning
In sonar and radar receiver signal chains, the HI5812JIBZ serves as a back-end digitizer after the IF amplifier and detector stages. The internal track-and-hold captures the conditioned IF envelope at the right moment, and the 12-bit / 50 kSPS throughput is sufficient for sub-audio to low-audio bandwidth return signals. The SAR architecture produces no pipeline latency, simplifying target-range correlation in firmware. The 24-SOIC package handles thermal rise at the rated 25 mW power dissipation in sealed enclosures. Provide separate analog and digital ground planes joined only at the AGND pin for clean returns.
Recommended
Digital Audio Front-End Monitoring
For digital audio monitoring and level-metering, the HI5812JIBZ provides a cost-effective RMS-detection digitizer. Sample the audio envelope with a 50 kSPS rate, well above the audible 20 kHz Nyquist limit, and feed the parallel data bus to a microcontroller that computes peak and average levels. The 12-bit resolution (72 dB dynamic range) is sufficient for simple VU/peak metering and for amplitude-tracking DSP feedback. A small anti-alias RC on AIN (typically 10 kOhm + 1 nF) cleans high-frequency noise before the ADC's input. The wide 24-SOIC package simplifies thermal management in dense audio mixer chassis.
Recommended
Embedded Sensor Interface for Microcontrollers
Pair the HI5812JIBZ with a microcontroller that lacks an integrated ADC (such as legacy 8051 or low-cost ARM Cortex-M0 parts) to add analog input capability. The parallel 8-bit MSB mode maps directly to an MCU's 8-bit port, simplifying firmware reads without bit-banging. The CONVERT_START input and DATA_READY flag generate an edge-triggered interrupt for low-power wait modes, letting the CPU sleep between conversions. The single +5 V supply avoids the level shifters required for newer 3.3 V ADCs. The 24-SOIC package drops onto a standard 1.27 mm pitch SOIC footprint, compatible with hand-soldered prototypes and reflow production.
Recommended
Recommended Products Summary
Engineering reference data for HI5812JIBZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | HI5812JIBZ-T | HI5812KIBZ | ADS8505IDBR |
|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Texas Instruments |
| Package | 24-SOIC (wide body) | 24-SOIC (wide body) - same | 24-SOIC (wide body) - same | 28-SSOP - similar, smaller |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit |
| Sample Rate | 50 kSPS | 50 kSPS | 50 kSPS | 100 kSPS (faster) |
| Conversion Time | 20 us | 20 us | 20 us | 10 us (faster) |
| Architecture | SAR + internal T/H | SAR + internal T/H | SAR + internal T/H | SAR + internal T/H |
| Analog Supply | +5 V | +5 V | +5 V | +5 V |
| Digital Interface | Parallel, 12/8/4-bit muxed | Parallel, 12/8/4-bit muxed | Parallel, 12/8/4-bit muxed | Parallel, 12/8-bit muxed |
| INL (max) | 1.5 LSB | 1.5 LSB | 1.5 LSB | 1.0 LSB (better) |
| Power Dissipation | 25 mW | 25 mW | 25 mW | 30 mW (higher) |
Key Differentiators
- Integrated track-and-hold amplifier on-chip (vs Discrete ADC + external S/H op-amp front ends)
- User-selectable 12/8/4-bit parallel bus (vs AD7890 (serial-only) or ADS8505 (12/8-bit only))
- Wide-body 24-SOIC simplifies hand-soldering and thermal management (vs ADS8505IDBR 28-SSOP (smaller, harder to rework))
Design Notes
Estimated: at +5 V supply the HI5812JIBZ draws about 5 mA from AVDD plus a smaller digital current from DVDD, totaling roughly 25 mW. Use a star-ground topology: route AVDD from a low-noise LDO (such as TPS7A45xx family) and decouple with a 10 uF tantalum in parallel with a 100 nF X7R ceramic placed within 5 mm of the AVDD pin. DVDD may be sourced from the same +5 V rail but should be filtered with a ferrite bead to keep digital switching noise out of the analog domain. The VREF pin must be decoupled locally and driven by a low-impedance buffer (or a Kelvin connection) to maintain full 12-bit absolute accuracy across temperature.
Use a four-layer PCB with separate analog and digital ground planes joined only at the AGND pin (pin 19) directly under the package. Route analog input traces (AIN) as short, guarded, 50-ohm-controlled traces away from digital data bus lines (D0-D11, CONVERT_START, DATA_READY). Place the 24-SOIC with the orientation marker at the top-left so pin 1 is at the top-left as in the datasheet. Add a ground ring around the AIN input pin to minimize leakage into the high-impedance sample-and-hold. Keep the AGND-to-DGND tie short and wide; never split the ground plane under the ADC body.
Do not exceed VREF on the AIN pin; overdrive can damage the internal ESD clamps and permanently shift the offset. The VREF pin must be driven by a low-impedance source - a high-resistance reference divider will load-share with the ADC's internal DAC ladder and introduce gain error. The DATA_READY flag is a falling-edge transition that indicates end-of-conversion, so it must be edge-detected, not level-sampled. When using 8-bit bus mode, drive the 8/12_SELECT pin high and read the MSB byte first; the LSB nibble is held in the lower data lines only when the bus is in 12-bit mode.
Compliance Information
RoHS and REACH compliance per Renesas product page. Not AEC-Q100 qualified - not suitable for automotive safety-critical applications. Lead-free (Pb-free) and halogen-free per JEDEC J-STD-609 marking. Conflict-minerals compliant per Renesas supply-chain policy.
