MCP4922-E/SL Microchip Technology Inc., MCP4922-E/SL Datasheet - Page 15

• Manufacturer Part Number: MCP4922-E/SL
• Description: DUAL 12-BIT DAC WITH SPI INTERACE
• Manufacturer: Microchip Technology Inc.

Specifications of MCP4922-E/SL

• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

3.0
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
3.1
V
supply is relative to AV
5.5V. A decoupling capacitor on V
to achieve maximum performance.
3.2
CS is the chip select input, which requires an active-low
signal to enable serial clock and data functions.
3.3
SCK is the SPI compatible serial clock input.
3.4
SDI is the SPI compatible serial data input.
3.5
LDAC (the latch DAC syncronization input) transfers
the input latch registers to the DAC registers (output
latches) when low. Can also be tied low if transfer on
the rising edge of CS is desired.
© 2007 Microchip Technology Inc.
DD
MCP4921
Pin No.
is the positive power supply input. The input power
—
—
—
—
—
—
1
2
3
4
5
7
6
8
PIN DESCRIPTIONS
Positive Power Supply Input (V
Chip Select (CS)
Serial Clock Input (SCK)
Serial Data Input (SDI)
Latch DAC Input (LDAC)
PIN FUNCTION TABLE
MCP4922
Pin No.
SS
10
12
13
14
11
1
2
3
4
5
6
7
8
9
and can range from 2.7V to
DD
is recommended
Symbol
SHDN
V
V
V
V
LDAC
AV
SCK
V
SDI
OUTB
OUTA
NC
CS
NC
NC
REFB
REFA
DD
SS
DD
)
Positive Power Supply Input (2.7V to 5.5V)
Chip Select Input
Syncronization input used to transfer DAC settings from serial
latches to the output latches.
Hardware Shutdown Input
DAC
DAC
Analog ground
DAC
DAC
No Connection
Serial Clock Input
Serial Data Input
No Connection
No Connection
B
B
A
A
Output
Voltage Input (AV
Voltage Input (AV
Output
3.6
SHDN is the hardware shutdown input that requires an
active-low input signal to configure the DACs in their
low-power Standby mode.
3.7
V
amplifier drives these pins with a range of AV
3.8
V
The analog signal on these pins is utilized to set the ref-
erence voltage on the string DAC. The input signal can
range from AV
3.9
AV
OUTA
REFA
SS
is the analog ground pin.
and V
and V
Hardware Shutdown Input (SHDN)
DAC
DAC
(V
Analog Ground (AV
REFA
OUTB
REFB
SS
SS
SS
x
X
MCP4921/4922
to V
to V
Function
Outputs (V
Voltage Reference Inputs
to V
, V
are DAC outputs. The DAC output
are DAC voltage reference inputs.
DD
DD
REFB
DD
)
)
.
)
OUTA
SS
DS21897B-page 15
, V
)
OUTB
SS
)
to V
DD
.