STJK(HK) ELECTRONICS CO.,LIMITED
STJK(HK) ELECTRONICS CO.,LIMITED Quality first, reputation first, service first, customers first.
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PRODUCT DESCRIPTION
The AD420 is a complete digital to current loop output converter, designed to meet the needs of the industrial control market. It provides a high precision, fully integrated, low cost single-chip solution for generating current loop signals in a compact 24-lead SOIC or PDIP package.
The output current range can be programmed to 4 mA to 20 mA, 0 mA to 20 mA or to an overrange function of 0 mA to 24 mA. The AD420 can alternatively provide a voltage output from a separate pin that can be configured to provide 0 V to 5 V, 0 V to 10 V, ±5 V, or ±10 V with the addition of a single external buffer amplifier.
The 3.3 M Baud serial input logic design minimizes the cost of galvanic isolation and allows for simple connection to commonly used microprocessors. It can be used in 3-wire or asynchronous mode and a serial-out pin is provided to allow daisy chaining of multiple DACs on the current loop side of the isolation barrier.
The AD420 uses sigma-delta (Σ-Δ) DAC technology to achieve 16-bit monotonicity at very low cost. Full-scale settling to 0.1% occurs within 3 ms. The only external components that are required (in addition to normal transient protection circuitry) are two low cost capacitors which are used in the DAC output filter.
PRODUCT PROPERTIES
| Product Status | Active |
| Number of Bits | 16 |
| Number of D/A Converters | 1 |
| Settling Time | 3ms |
| Output Type | Voltage or Current - Buffered |
| Differential Output | No |
| Data Interface | SPI |
| Reference Type | External, Internal |
| Voltage - Supply, Analog | 12V ~ 32V |
| Voltage - Supply, Digital | 12V ~ 32V |
| INL/DNL (LSB) | - |
| Architecture | Sigma-Delta |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 24-DIP (0.300", 7.62mm) |
| Supplier Device Package | 24-PDIP |
| Mounting Type | Through Hole |
| Base Product Number | AD420 |
