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Renesas HI7190IBZ
- Part No.:
- HI7190IBZ
- Manufacturer:
- Renesas
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
HI7190IBZ.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:246
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Product details
Overview
The HI7190IBZ from Intersil is a 24-bit sigma-delta analog-to-digital converter with integrated programmable-gain instrumentation amplifier (PGIA), differential analog/reference inputs, and on-demand auto-calibration. It operates from ±5V supplies, delivers 0.0007% typical integral non-linearity, 120dB 50/60Hz noise rejection, and supports input ranges from ±20mV to ±2.5V - ideal for high-precision industrial weight scales and laboratory instrumentation.
For engineers reviewing the HI7190IBZ datasheet, HI7190IBZ pinout, HI7190IBZ application, or HI7190IBZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SOIC-20 pin functions, and two confirmed alternative ADCs with documented functional and application-level differences.
Technical Context
The HI7190IBZ implements a third-order sinc digital filter with programmable notch frequencies (10Hz–1.953kHz), enabling precise trade-offs between resolution (up to 22-bit no-missing-code) and conversion speed. Its internal PGIA supports true analog gains of 1–128, with gains ≥16 implemented digitally post-modulation to preserve front-end SNR.
It features fully differential signal and reference paths, independent analog/digital supplies (AVDD/AVSS/DVDD), and a bidirectional serial interface compatible with both Motorola SPI and Intel SSR protocols. Calibration is supported via on-chip registers for offset, positive/negative full-scale correction - all accessible over the same serial port used for data reads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit output with 22-bit no-missing-code performance - ensures monotonicity in precision weighing and seismic monitoring systems. |
| INL (Typ) | ±0.0007% FS - enables sub-1ppm linearity-critical applications like calibration-grade lab instruments. |
| 50/60Hz Rejection | 120dB - eliminates mains interference without external notch filters in factory-floor process control. |
| Input Range | ±20mV to ±2.5V (bipolar) or 0–2.5V (unipolar) - accommodates low-level bridge sensors and higher-level transducer outputs without external gain stages. |
| PGIA Gain Range | 1 to 128 - removes need for external pre-amplifiers in multi-sensor industrial scale designs. |
| Settling Time | Max 4 conversions after step input - guarantees stable readings within <100ms at 10Hz notch setting. |
| Supply Voltages | AVDD = +5V, AVSS = –5V, DVDD = +5V - requires dual-rail analog supply; digital rail may share +5V with proper decoupling. |
Pinout & Package
HI7190IBZ is housed in a 20-lead SOIC package (M20.3 drawing), RoHS-compliant Pb-free plus anneal construction, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SCLK | Serial clock input | Synchronizes all SPI/SSR transfers; rising edge latches SDIO input, falling edge outputs SDO - must meet tSCLK ≥ 200ns min cycle time. |
| 2 SDO | Serial data output | Three-state output for 3-wire SPI mode; driven only when CS is active and read command issued - avoids bus contention in multi-device systems. |
| 3 SDIO | Bidirectional serial I/O | Configurable as input-only (Intel SSR) or bidirectional (Motorola SPI); requires external pull-up if used as open-drain input during writes. |
| 4 CS | Chip select | Active-low enable for serial interface; can be hard-wired to DGND in single-device systems to simplify microcontroller GPIO usage. |
| 5 DRDY | Data ready interrupt | Active-low open-drain signal indicating valid conversion result in Data Output Register - used to trigger DMA or ISR without polling. |
| 6 DGND | Digital ground | Reference for DVDD and all digital I/O; must be isolated from AGND except at single-point star ground near power supply. |
| 7 AVSS | Negative analog supply | –5V rail powering PGIA, modulator, and reference circuitry; requires low-ESR bulk + ceramic decoupling per datasheet layout guidelines. |
| 8 VRLO | Reference input low | Negative terminal of differential reference pair; tied to AGND in standard ±2.5V reference configuration. |
| 9 VRHI | Reference input high | Positive terminal of differential reference pair; tied to +2.5V for 5V full-scale bipolar range with gain=1. |
| 10 VCM | Common-mode voltage | Midpoint bias for internal analog circuitry; must be connected to (AVDD + AVSS)/2 (i.e., 0V) for optimal CMRR and distortion performance. |
| 11 VINLO | Analog input low | Inverting input of PGIA; forms fully differential pair with VINHI - rejects common-mode noise from long sensor cables. |
| 12 VINHI | Analog input high | Non-inverting input of PGIA; includes transducer burn-out current source (200nA) for open-wire fault detection in load cell interfaces. |
| 13 AVDD | Positive analog supply | +5V rail powering analog front-end; separate from DVDD to prevent digital switching noise from degrading ENOB. |
| 14 AGND | Analog ground | Reference for AVDD, AVSS, VRHI/VRLO, and analog inputs; must be partitioned from DGND on PCB to maintain >70dB CMRR. |
| 15 DVDD | Digital supply | +5V for logic core and serial interface; shares voltage with microcontroller but requires dedicated 0.1µF + 4.7µF decoupling at pin. |
| 16 OSC2 | Oscillator output | Connects to crystal second terminal; left open when using external 10MHz clock on OSC1 - sets modulator sampling rate and filter timing. |
| 17 OSC1 | Oscillator input | Accepts 0.1–10MHz clock source; 10MHz nominal for standard timing; VIH ≥3.5V - not compatible with 3.3V logic without level shift. |
| 18 RESET | Hardware reset | Active-low asynchronous reset; must be pulsed ≥100ns low at power-up to initialize Control Register to 28B300h and enter bipolar/gain=1 default state. |
| 19 SYNC | Synchronization input | Active-low signal to align conversion start across multiple HI7190IBZ devices - essential for synchronized multi-channel weighbridge systems. |
| 20 MODE | Serial interface mode | Selects Synchronous Self-Clocking (MODE=1) or Synchronous External Clocking (MODE=0); determines whether SCLK is generated internally or externally. |
Key Features
| Feature | Design Value |
|---|---|
| On-demand auto-calibration | Removes system-level offset/gain errors in under 10ms - enables recalibration during idle periods in battery-powered portable instruments. |
| Programmable digital filter | Notch frequency adjustable from 10Hz to 1.953kHz - allows dynamic optimization of resolution (22-bit @ 10Hz) vs. throughput (1.95ksps @ 1.953kHz). |
| Differential transducer burn-out detection | 200nA current source on VINHI - detects open-circuit load cells or broken RTD leads without adding external components. |
| Flexible data coding | Configurable 2's complement (bipolar), offset binary (bipolar), or straight binary (unipolar) output - simplifies firmware integration across diverse host MCUs. |
| Independent analog/digital supplies | Separate AVDD/AVSS/DGND/AGND pins - enables clean analog domain isolation in mixed-signal industrial controllers with noisy digital subsystems. |
Applications
| Industrial Weight Scales | Process Control and Measurement |
|---|---|
Use Scenario: High-accuracy platform scales for pharmaceutical batching and material handling, requiring 10,000+ count resolution and thermal drift compensation. IC Role / Device Role / Timing Role: Primary sigma-delta ADC with integrated PGIA, performing continuous 24-bit conversions at 10Hz with auto-calibration triggered before each batch cycle. Use Value: Eliminates external instrumentation amps and anti-alias filters, reducing BOM cost by $1.20/unit while maintaining ±0.001% linearity over –10°C to +50°C ambient. |
Use Scenario: Analog input module in PLC backplane measuring temperature (RTD), pressure (4–20mA loop), and flow (vortex sensor) signals simultaneously. IC Role / Device Role / Timing Role: Precision ADC front-end for multi-channel multiplexed acquisition; SYNC pin synchronizes conversions across four HI7190IBZ devices on one carrier board. Use Value: Achieves 120dB 50/60Hz rejection without software filtering - critical for stable PID loop performance in electrically noisy factory environments. |
| Laboratory Instrumentation | Seismic Monitoring |
Use Scenario: Benchtop digital multimeter (DMM) or data acquisition system requiring calibrated 6½-digit accuracy and low-noise DC measurements. IC Role / Device Role / Timing Role: Core measurement engine with on-chip calibration registers storing factory-trimmed coefficients; user-accessible via serial interface for field recalibration. Use Value: Enables traceable metrology-grade calibration without proprietary tools - meets ISO/IEC 17025 requirements for accredited test labs. |
Use Scenario: Low-frequency geophone signal conditioning in remote seismic arrays, operating unattended for months on solar/battery power. IC Role / Device Role / Timing Role: Ultra-low-drift ADC capturing sub-millivolt ground motion signals; standby power dissipation of 5mW extends battery life beyond 18 months. Use Value: 22-bit no-missing-code resolution at 10Hz captures microseismic events down to Richter 0.5 magnitude without data gaps or quantization artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1256IDBT | 24-bit delta-sigma ADC with PGA (1–128), but uses single +5V supply (no ±5V required); lower INL (±0.0005% typ) but no transducer burn-out current. | Preferred for new designs targeting simplified power architecture and lower system cost; unsuitable where existing ±5V rails are fixed. | Select ADS1256IDBT when redesigning for single-supply operation and highest linearity; retain HI7190IBZ for legacy ±5V systems or burn-out diagnostics. |
| MAX11200EEE+ | 24-bit delta-sigma ADC with PGA (1–128), 120dB 50/60Hz rejection, but only 16-pin TSSOP package; lacks SYNC pin and burn-out current source. | Fits space-constrained portable instruments; cannot support synchronized multi-ADC acquisition or open-wire fault detection. | Choose MAX11200EEE+ for handheld DMMs or compact sensor nodes; choose HI7190IBZ for rack-mounted industrial controllers needing synchronization and diagnostics. |
Compared with ADS1256IDBT and MAX11200EEE+, the HI7190IBZ uniquely combines ±5V operation, hardware SYNC for multi-device alignment, and integrated transducer burn-out detection - making it irreplaceable in legacy industrial scale platforms and seismic arrays requiring deterministic timing and sensor health monitoring.
Availability
HI7190IBZ is available at Aetrix Electronics and suitable for industrial weight scales, process control systems, and laboratory instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for HI7190IBZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, aerospace, and test equipment markets.
The HI7190IBZ belongs to Intersil's high-precision sigma-delta ADC product line, designed specifically for low-frequency, wide-dynamic-range measurement applications where linearity, noise rejection, and system-level calibration integrity are critical.
FAQ
What is the maximum achievable effective resolution of the HI7190IBZ at 10Hz notch frequency?
The HI7190IBZ achieves up to 22-bit effective number of bits (ENOB) at 10Hz notch frequency with gain=1, corresponding to 132.3dB SNR and 1.5µV RMS noise. This is measured with inputs tied to analog ground and reflects real-world resolution after digital filtering - not theoretical 24-bit output word length. The HI7190IBZ maintains this performance across its full –40°C to +85°C operating range when properly calibrated.
Does the HI7190IBZ require external components for basic operation?
Yes - the HI7190IBZ requires external decoupling capacitors (0.1µF + 4.7µF per supply pin), a 10MHz crystal or oscillator on OSC1/OSC2, and proper analog/digital ground separation. Unlike some newer ADCs, it does not integrate reference buffers or LDOs. However, it eliminates external PGIA, anti-alias filters, and calibration DACs - reducing total component count by 6–8 parts compared to discrete solutions.
Can the HI7190IBZ operate from a single +5V supply?
No - the HI7190IBZ requires dual ±5V analog supplies (AVDD = +5V, AVSS = –5V) and a separate +5V digital supply (DVDD). Application Note AN9601 describes workarounds using charge pumps or DC/DC inverters to generate –5V from +5V, but these add complexity and noise. For true single-supply designs, consider alternatives like the ADS1256IDBT.
How does the transducer burn-out detection function on the HI7190IBZ work?
The HI7190IBZ provides a 200nA constant-current source on the VINHI pin, enabled via the Control Register. When connected to a load cell or strain gauge, an open circuit causes VINHI to float toward AVDD, triggering a detectable voltage shift. This allows firmware to flag sensor faults without external comparators or current sources - a key diagnostic feature in certified weighing systems.
Is the HI7190IBZ pin-compatible with the HI7190IP or HI7190IB variants?
Yes - the HI7190IBZ shares identical pinout and electrical specifications with HI7190IP (PDIP) and HI7190IB (SOIC), differing only in RoHS-compliant Pb-free plus anneal termination and packaging. All three are drop-in replacements in PCB layouts; no schematic or firmware changes are needed when migrating from HI7190IB to HI7190IBZ for RoHS compliance.
HI7190IBZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 625
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- ±5V
- Voltage - Supply, Digital:
- 5V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
HI7190IBZ FAQ
1.How can I place an order for HI7190IBZ through Aetrix?
Please submit a Request for Quotation (RFQ) for HI7190IBZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for HI7190IBZ reliable?
The price and inventory of HI7190IBZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HI7190IBZ is usually 5 days.
3.What payment methods are accepted for HI7190IBZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HI7190IBZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HI7190IBZ?
HI7190IBZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HI7190IBZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for HI7190IBZ?
For technical support, including HI7190IBZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HI7190IBZ requirements.
6.How does Aetrix verify that HI7190IBZ is sourced from the original manufacturer or authorized distributors?
All HI7190IBZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that HI7190IBZ meets industry standards.
7.What is the process for return or replacement of HI7190IBZ?
All HI7190IBZ units undergo pre-shipment inspection (PSI). If there is an issue with HI7190IBZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The HI7190IBZ part is unused and in its original packaging.
Return procedure for HI7190IBZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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