component
AD5421BCPZ-REEL7
Public Made by Adomby adom
Analog Devices Digital To Analog Converters (DAC), LFCSP-32(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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Symbol & Footprint
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PCB Footprint
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Datasheet
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Contents
README
markdownAD5421BCPZ-REEL7
Analog Devices · Digital To Analog Converters (DAC) · LFCSP-32(5x5)
AD5421BCPZ-REEL7 from Analog Devices, in a LFCSP-32(5x5). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SDIN | input | Serial data input; data must be valid on the falling edge of SCLK. |
| 2 | LDAC | input | Active-low load DAC input that updates the DAC register and output current; it should not be left unconnected. |
| 3 | FAULT | output | Active-high fault alert output, asserted on loop current out of range, insufficient loop voltage, overtemperature, SPI control loss or communication (PEC) error. |
| 4 | COM | power_in | Ground reference pin for the AD5421; a 4.7 V Zener diode is recommended between LOOP− and COM. |
| 5 | DVDD | power_out | 3.3 V digital power supply output, to be decoupled to COM with 100 nF and 4.7 μF capacitors. |
| 6 | ALARM_CURRENT_DIRECTION | input | Selects upscale alarm current (22.8 mA/24 mA) when connected to DVDD or downscale alarm current (3.2 mA) when connected to COM. |
| 7 | RINT/REXT | input | Connect to DVDD to select the internal current setting resistor or to COM to select the external resistor between REXT1 and REXT2. |
| 8 | RANGE0 | input | Digital input that selects the loop current range together with RANGE1. |
| 9 | NC | unconnected | No connect; do not connect to this pin. |
| 10 | RANGE1 | input | Digital input that selects the loop current range together with RANGE0. |
| 11 | COM | power_in | Ground reference pin for the AD5421; a 4.7 V Zener diode is recommended between LOOP− and COM. |
| 12 | COM | power_in | Ground reference pin for the AD5421; a 4.7 V Zener diode is recommended between LOOP− and COM. |
| 13 | REG_SEL2 | input | Together with REG_SEL0 and REG_SEL1, selects the REGOUT voltage between 1.8 V and 12 V. |
| 14 | REG_SEL1 | input | Together with REG_SEL0 and REG_SEL2, selects the REGOUT voltage between 1.8 V and 12 V. |
| 15 | REG_SEL0 | input | Together with REG_SEL1 and REG_SEL2, selects the REGOUT voltage between 1.8 V and 12 V. |
| 16 | NC | unconnected | No connect; do not connect to this pin. |
| 17 | REFIN | input | Reference voltage input; VREFIN = 2.5 V for specified performance. |
| 18 | REFOUT2 | power_out | Internal 1.22 V reference output; a 100 nF capacitor to COM is recommended. |
| 19 | REFOUT1 | power_out | Internal 2.5 V reference output; a 100 nF capacitor to COM is recommended. |
| 20 | CIN | passive | External capacitor to COM sets the output slew rate control and also serves as the HART FSK input through a capacitor. |
| 21 | REXT1 | passive | Connection for the external current setting resistor; a precision 24 kΩ resistor can be connected between REXT1 and REXT2. |
| 22 | REXT2 | passive | Connection for the external current setting resistor; a precision 24 kΩ resistor can be connected between REXT1 and REXT2. |
| 23 | LOOP− | passive | Loop current return pin, used with COM to sense the loop current across the internal 52 Ω resistor; the voltage at LOOP− is negative with respect to COM. |
| 24 | VLOOP | input | Voltage input with a range of 0 V to 2.5 V, digitized to eight bits for the fault register and intended for loop supply monitoring via a 20:1 divider. |
| 25 | NC | unconnected | No connect; do not connect to this pin. |
| 26 | DRIVE | output | Gate connection for an external depletion mode MOSFET; DRIVE to COM is rated −0.3 V to +11 V. |
| 27 | REGIN | power_in | Voltage regulator input, rated 5.5 V to 52 V with respect to LOOP−, which may be connected directly to the loop voltage or to an external pass transistor. |
| 28 | REGOUT | power_out | Voltage regulator output selectable from 1.8 V to 12 V via REG_SEL0-REG_SEL2, decoupled to COM with a >1 µF capacitor when driving a microconverter supply. |
| 29 | IODVDD | power_in | Digital interface supply; digital thresholds are referenced to it and it accepts 1.71 V to 5.5 V with respect to COM. |
| 30 | SDO | output | Serial data output clocked out on the rising edge of SCLK and valid on the falling edge of SCLK. |
| 31 | SCLK | input | Serial clock input, data clocked in on the falling edge, operating at clock speeds up to 30 MHz. |
| 32 | SYNC | input | Active-low frame synchronization input; data is transferred on SCLK falling edges while low and latched on the rising edge of SYNC. |
| 33 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | LFCSP-32(5x5) |
| Category | Data Acquisition |
| Pins | 33 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Regin to COM | -0.3 | 60 | V | 11 | |||
| REGOUT to COM | -0.3 | 14 | V | 11 | |||
| Digital inputs (RANGE0, RANGE1, RINT/REXT, ALARM_CURRENT_DIRECTION, REG_SEL0-2) to COM | -0.3 | 7 | V | or DVDD + 0.3 V, whichever is less | 11 | ||
| Digital inputs SCLK, SDIN, SYNC, LDAC to COM | -0.3 | 7 | V | or IODVDD + 0.3 V, whichever is less | 11 | ||
| Digital outputs SDO, FAULT to COM | -0.3 | 7 | V | or IODVDD + 0.3 V, whichever is less | 11 | ||
| REFIN to COM | -0.3 | 7 | V | 11 | |||
| REFOUT1, REFOUT2 | -0.3 | 4.7 | V | 11 | |||
| VLOOP to COM | -0.3 | 60 | V | 11 | |||
| LOOP− to COM | -5 | 0.3 | V | 11 | |||
| DVDD to COM | -0.3 | 7 | V | 11 | |||
| IODVDD to COM | -0.3 | 7 | V | 11 | |||
| REXT1, CIN to COM | -0.3 | 4.3 | V | 11 | |||
| REXT2 to COM | -0.3 | 0.3 | V | 11 | |||
| DRIVE to COM | -0.3 | 11 | V | 11 | |||
| Operating temperature range (TA), industrial | TA | -40 | 105 | °C | 11 | ||
| Storage temperature range | -65 | 150 | °C | 11 | |||
| Junction temperature (TJ MAX) | TJ MAX | 125 | °C | 11 | |||
| Thermal resistance junction-to-ambient, 32-lead LFCSP (CP-32-12) | θJA | 40 | °C/W | JEDEC 2S2P test board with thermal vias | 11 | ||
| Thermal resistance junction-to-case, 32-lead LFCSP (CP-32-12) | θJC | 7 | °C/W | 11 | |||
| Loop voltage range | 5.5 | 52 | V | 1 | |||
| IODVDD digital interface supply | IODVDD | 1.71 | 5.5 | V | 12 | ||
| Total Unadjusted Error (TUE), internal RSET | -0.18 | 0.18 | % FSR | B grade | 4 | ||
| Total Unadjusted Error (TUE), internal RSET | -0.06 | 0.011 | 0.06 | % FSR | B grade, TA = 25°C | 4 | |
| Relative Accuracy (INL), internal RSET | -0.012 | 0.006 | 0.012 | % FSR | B grade | 4 | |
| Differential Nonlinearity (DNL) | -1 | 1 | LSB | Guaranteed monotonic | 4 | ||
| Offset Error | -0.056 | 0.056 | % FSR | B grade and C grade | 4 | ||
| Offset Error | -0.008 | 0.0008 | 0.008 | % FSR | B grade and C grade, TA = 25°C | 4 | |
| Gain Error | -0.107 | 0.107 | % FSR | B grade and C grade | 4 | ||
| Gain Error | -0.035 | 0.0058 | 0.035 | % FSR | B grade and C grade, TA = 25°C | 4 | |
| Full-Scale Error | -0.126 | 0.126 | % FSR | B grade and C grade | 4 | ||
| Full-Scale Error | -0.041 | 0.0065 | 0.041 | % FSR | B grade and C grade, TA = 25°C | 4 | |
| Downscale Alarm Current, internal RSET | 3.19 | 3.21 | mA | 4 | |||
| Upscale Alarm Current, internal RSET | 22.77 | 22.83 | mA | 4 mA to 20 mA and 3.8 mA to 21 mA ranges | 4 | ||
| Upscale Alarm Current, internal RSET | 23.97 | 24.03 | mA | 3.2 mA to 24 mA range | 4 | ||
| Total Unadjusted Error (TUE), external RSET (24 kΩ) | -0.08 | 0.08 | % FSR | external RSET (24 kΩ), B grade | 4 | ||
| Total Unadjusted Error (TUE), external RSET (24 kΩ) | -0.04 | 0.003 | 0.04 | % FSR | external RSET (24 kΩ), B grade, TA = 25°C | 4 | |
| Relative Accuracy (INL), external RSET (24 kΩ) | -0.012 | 0.006 | 0.012 | % FSR | external RSET (24 kΩ), B grade | 4 | |
| Offset Error, external RSET (24 kΩ) | -0.021 | 0.021 | % FSR | external RSET (24 kΩ) | 4 | ||
| Gain Error, external RSET (24 kΩ) | -0.03 | 0.03 | % FSR | external RSET (24 kΩ) | 4 | ||
| Full-Scale Error, external RSET (24 kΩ) | -0.047 | 0.047 | % FSR | external RSET (24 kΩ) | 5 | ||
| Downscale Alarm Current, external RSET (24 kΩ) | 3.08 | 3.21 | mA | external RSET (24 kΩ) | 5 | ||
| Upscale Alarm Current, external RSET (24 kΩ) | 22.78 | 23 | mA | external RSET (24 kΩ); 4 mA to 20 mA and 3.8 mA to 21 mA ranges | 5 | ||
| Upscale Alarm Current, external RSET (24 kΩ) | 23.99 | 24.01 | mA | external RSET (24 kΩ); 3.2 mA to 24 mA range | 5 | ||
| Loop Compliance Voltage (LOOP− + value) | 5.5 | V | REGOUT < 5.5 V, loop current = 24 mA | 5 | |||
| Loop Compliance Voltage (LOOP− + value) | 12.5 | V | REGOUT = 12 V, loop current = 24 mA | 5 | |||
| Resistive Load | 0 | 2 | kΩ | See Figure 21 for a load line graph | 5 | ||
| Power Supply Sensitivity (loop output) | 0.1 | µA/V | Loop current = 12 mA | 5 | |||
| Output TC, internal RSET | 3 | ppm FSR/°C | Loop current = 12 mA, internal RSET | 5 | |||
| REFOUT1 Output Voltage | 2.498 | 2.5 | 2.503 | V | TA = 25°C | 5 | |
| REFOUT1 Temperature Coefficient | 2 | 8 | ppm/°C | B grade | 5 | ||
| REFOUT2 Output Voltage | 1.18 | 1.227 | 1.28 | V | TA = 25°C | 5 | |
| REGOUT Output Voltage | 1.8 | 12 | V | See Table 10 | 6 | ||
| REGOUT Output Voltage Accuracy | -4 | 2 | 4 | % | 6 | ||
| DVDD Output Voltage | 3.17 | 3.3 | 3.48 | V | 6 | ||
| ADC Accuracy, Die Temperature | -5 | 5 | °C | 6 | |||
| ADC Accuracy, VLOOP Input | -1 | 1 | % | 6 | |||
| Digital Input Current (SCLK, SYNC, SDIN, LDAC) | -0.015 | 0.015 | µA | Per pin | 6 | ||
| SDO Output Low Voltage | VOL | 0.4 | V | 6 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | COPPER | 1. THE EXPOSED PADDLE SHOULD BE CONNECTED TO THE SAME POTENTIAL AS THE COM PIN AND TO A COPPER PLANE FOR | 12 |
CAD (KiCad official)
- Symbol:
AD5421BCPZ-REEL7 - Footprint:
Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm - 3D model: LFCSP-32(5x5) (KiCad packages3D, STEP)
- 3D model files:
ad5421bcpz-reel7-etched.step/ad5421bcpz-reel7-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ad5421bcpz-reel7.step/ad5421bcpz-reel7.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (36 pp, sha256
76646178e298d83d, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).