max5812peut-t Maxim Integrated Products, Inc., max5812peut-t Datasheet - Page 11

• Manufacturer Part Number: max5812peut-t
• Description: Max5812 12-bit Low-power, 2-wire, Serial Voltage-output Dac
• Manufacturer: Maxim Integrated Products, Inc.

In read mode (R/W = 1), the MAX5812 writes the con-
tents of the DAC register to the bus. The direction of
data flow reverses after the address acknowledge by
the MAX5812. The device transmits the first byte of
data, waits for the master to acknowledge, and then
transmits the second byte. Figure 7 shows an example-
read data sequence.
The MAX5812 is compatible with existing I
SCL and SDA are high-impedance inputs; SDA has an
open drain that pulls the data line low during the ninth
clock pulse. The Typical Operating Circuit shows a typ-
ical I
ports standard I
call address is ignored. The MAX5812 address is com-
Figure 7. Example Read Word Data Sequence
Figure 8. Powering the MAX5812 from An External Reference
2
C application. The communication protocol sup-
S
Sr
MSB
MSB
A6
D7
MSB
A6
IN
2
C 8-bit communications. The general
A5
D6
MAX6030/
______________________________________________________________________________________
MAX6050
GND
A5
A4
D5
OUT
A4
A3
D4
A3
A2
D3
A2
DATA BYTES GENERATED BY MAX5812
Read Data Format
I
MAX5812
2
A1
D2
12-Bit Low-Power, 2-Wire, Serial
V
GND
C Compatibility
DD
DATA BYTES GENERATED BY MASTER DEVICE
A1
A0
2
D1
C systems.
OUT
A0
LSB
R/W
LSB
= 0
D0
LSB
R/W
= 1
ACK
ACK
ACK
MSB
patible only with the 7-bit I
bit address formats are not supported.
When the MAX5812 detects an address mismatch, the
serial interface disconnects the SCL signal from the
core circuitry. This minimizes digital feedthrough
caused by the SCL signal on a static output. The serial
interface reconnects the SCL signal when a valid
START condition is detected.
The MAX5812 uses the V
ence. Any power-supply noise is directly coupled to the
device output. The circuit in Figure 8 uses a precision
voltage reference to power the MAX5812, isolating the
device from any power-supply noise. Powering the
MAX5812 in such a manner greatly improves overall
performance, especially in noisy systems. The
MAX6030 (3V, 75ppm/°C) or the MAX6050 (5V,
75ppm/°C) precision voltage references are ideal
choices because of the low power requirements of the
MAX5812.
The MAX5812 2-wire digital interface is I
compatible. The two digital inputs (SCL and SDA) load
C3
P
MSB
X
C2
Voltage-Output DAC
X
X
PD1
Digital Inputs and Interface Logic
Digital Feedthrough Suppression
ACK GENERATED BY
Applications Information
X
PD0
MASTER DEVICE
Powering the Device From an
X
D11
DD
X
2
C addressing protocol. Ten-
D10
as the DAC voltage refer-
External Reference
X
D9
LSB
X
LSB
D8
2
C and SMBus-
ACK
ACK
11