SPI/I2C Compatible, Temperature Sensor,
4-Channel ADC and Quad Voltage Output DAC
ADT7518
FEATURES
APPLICATIONS
Four 8-bit DACs
Portable battery-powered instruments
Buffered voltage output
Personal computers
Guaranteed monotonic by design over all codes
10-bit temperature-to-digital converter
10-bit 4-channel ADC
Smart battery chargers
Telecommunications systems
Electronic text equipment
Domestic appliances
DC input bandwidth
Input range: 0 V to 2.25 V
Process control
Temperature range: –40°C to +120°C
Temperature sensor accuracy of typ: 0.5°C
Supply range: 2.7 V to 5.5 V
PIN CONFIGURATION
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
V
V
-B
1
2
3
4
5
6
7
8
16
15
V
V
-C
OUT
OUT
OUT
OUT
-A
-D
V
-IN
14 AIN4
REF
ADT7518
TOP VIEW
CS
13 SCL/SCLK
12 SDA/DIN
11 DOUT/ADD
10 INT/INT
GND
(Not to Scale)
V
DD
D+/AIN1
D–/AIN2
9
LDAC/AIN3
Figure 1.
SPI®, I2C®, QSPI™, MICROWIRE™, and DSP-compatible
4-wire serial interface
SMBus packet error checking (PEC)-compatible
16-lead QSOP package
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-
GENERAL DESCRIPTION
The ADT75181 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.
LDAC
nal
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.
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.
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.
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.
1 Protected by the following U.S. Patent Numbers: 6,169,442; 5,867,012;
5,764174. Other patents pending.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
www.analog.com
© 2004 Analog Devices, Inc. All rights reserved.
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