ADT7518_15 Datasheet, PDF (1/40 Pages) Analog Devices – SPI/IC Compatible, Temperature Sensor, 4-Channel ADC and Quad Voltage Output DAC

SPI/I²C Compatible, Temperature Sensor,
4-Channel ADC and Quad Voltage Output DAC
ADT7518
FEATURES
Four 8-bit DACs
Buffered voltage output
Guaranteed monotonic by design over all codes
10-bit temperature-to-digital converter
10-bit 4-channel ADC
DC input bandwidth
Input range: 0 V to 2.25 V
Temperature range: –40°C to +120°C
Temperature sensor accuracy of typ: ±0.5°C
Supply range: 2.7 V to 5.5 V
DAC output range: 0 V to 2 VREF
Power-down current: 1 µA
Internal 2.25 VREF option
Double-buffered input logic
Buffered reference input
Power-on reset to 0 V DAC output
Simultaneous update of outputs (LDAC function)
On-chip rail-to-rail output buffer amplifier
SPI^®, I²C^®, QSPI™, MICROWIRE™, and DSP-compatible
4-wire serial interface
SMBus packet error checking (PEC)-compatible
16-lead QSOP package
GENERAL DESCRIPTION
The ADT7518 combines a 10-bit temperature-to-digital
converter, a 10-bit 4-channel ADC, and a quad 8-bit DAC, in a
16-lead QSOP package. The part also includes a band gap
temperature sensor and a 10-bit ADC to monitor and digitize
the temperature reading to a resolution of 0.25°C.
The ADT7518 operates from a single 2.7 V to 5.5 V supply. The
input voltage range on the ADC channels is 0 V to 2.25 V, and
the input bandwidth is dc. The reference for the ADC channels
is derived internally. The output voltage of the DAC ranges
from 0 V to VDD, with an output voltage settling time of 7 ms
typical.
The ADT7518 provides two serial interface options: a 4-wire
serial interface that is compatible with SPI, QSPI, MICROWIRE,
and DSP interface standards, and a 2-wire SMBus/I²C interface.
It features a standby mode that is controlled through the serial
interface.
APPLICATIONS
Portable battery-powered instruments
Personal computers
Smart battery chargers
Telecommunications systems
Electronic text equipment
Domestic appliances
Process control
PIN CONFIGURATION
V_OUT-B 1
16 V_OUT-C
V_OUT-A 2
15 V_OUT-D
V_REF-IN 3
14 AIN4
CS 4 ^ADT7518 13 SCL/SCLK
GND 5 ^{TOP VIEW} 12 SDA/DIN
(Not to Scale)
V_DD 6
11 DOUT/ADD
D+/AIN1 7
10 INT/INT
D–/AIN2 8
9 LDAC/AIN3
Figure 1.
The reference for the four DACs is derived either internally or
from a reference pin. The outputs of all DACs may be updated
simultaneously using the software LDAC function or the exter-
nal LDAC pin. The ADT7518 incorporates a power-on reset
circuit, which ensures that the DAC output powers up to 0 V
and remains there until a valid write takes place.
The ADT7518’s wide supply voltage range, low supply current,
and SPI-/I²C-compatible interface make it ideal for a variety of
applications, including personal computers, office equipment,
and domestic appliances.
It is recommended that new designs use the ADT7519 rather
than the ADT7518. The ADT7518’s internal and external temp-
erature accuracy spec is only valid when not using the internal
reference for the on-chip DAC. The ADT7519 does not have
this limitation.
Rev. A
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