MCP4922T-E/ST Microchip Technology, MCP4922T-E/ST Datasheet - Page 17

• Manufacturer Part Number: MCP4922T-E/ST
• Description: IC,D/A CONVERTER,DUAL,12-BIT,TSSOP,14PIN
• Manufacturer: Microchip Technology

Specifications of MCP4922T-E/ST

• Rohs Compliant: YES
• Settling Time: 4.5µs
• Number Of Bits: 12
• Data Interface: Serial, SPI™
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 14-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MCP4922T-E/ST; MCP4922T-E/STRTR; MCP4922T-E/STRTR; MCP4922T-E/STTR

3.0
The descriptions of the pins are listed in
TABLE 3-1:
3.1
V
supply voltage is relative to V
2.7V to 5.5V. The power supply at the V
be as clean as possible for a good DAC performance.
It is recommended to use an appropriate bypass
capacitor of about 0.1 µF (ceramic) to ground. An
additional 10 µF capacitor (tantalum) in parallel is also
recommended to further attenuate high frequency
noise present in application boards.
V
of the device. The user must connect the V
ground plane through a low-impedance connection. If
an analog ground path is available in the application
Printed Circuit Board (PCB), it is highly recommended
that the V
isolated within an analog ground plane of the circuit
board.
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 pin.
3.4
SDI is the SPI compatible serial data input pin.
 2010 Microchip Technology Inc.
DD
SS
is the analog ground pin and the current return path
is the positive supply voltage input pin. The input
Pin No.
10
12
13
14
11
1
2
3
4
5
6
7
8
9
PIN DESCRIPTIONS
Supply Voltage Pins (V
Chip Select (CS)
Serial Clock Input (SCK)
Serial Data Input (SDI)
SS
pin be tied to the analog ground path or
PIN FUNCTION TABLE
Symbol
SHDN
V
V
V
V
LDAC
SCK
V
SDI
V
OUTB
OUTA
NC
CS
NC
NC
REFB
REFA
DD
SS
SS
and can range from
Supply Voltage Input (2.7V to 5.5V)
No Connection
Chip Select Input
Serial Clock Input
Serial Data Input
No Connection
No Connection
Synchronization Input. This pin is used to transfer DAC settings (Input Registers)
to the output registers (V
Hardware Shutdown Input
DAC
DAC
Ground reference point for all circuitry on the device
DAC
DAC
DD,
Table
DD
B
B
A
A
V
Output
Reference Voltage Input (V
Reference Voltage Input (V
Output
SS
pin should
SS
3-1.
pin to a
)
OUT
3.5
LDAC (latch DAC synchronization input) pin is used to
transfer the input latch registers to their corresponding
DAC registers (output latches, V
low, both V
time with their input register contents. This pin can be
tied to low (V
rising edge of the CS pin. This pin can be driven by an
external control device such as an MCU I/O pin.
3.6
SHDN is the hardware shutdown input pin. When this
pin is low, both DAC channels are shut down. DAC
output is not available during the shutdown.
3.7
V
B output pin. Each output has its own output amplifier.
The DAC output amplifier of each channel can drive the
output pin with a range of V
3.8
V
A, and V
The reference on these pins is utilized to set the
reference voltage on the string DAC. The input signal
can range from V
V
OUTA
REFA
DD
)
MCP4902/4912/4922
.
is the voltage reference input for DAC channel
SS
SS
is the DAC A output pin, and V
REFB
Function
Latch DAC Input (LDAC)
Hardware Shutdown Input (SHDN)
Analog Outputs (V
Voltage Reference Inputs
(V
to V
to V
OUTA
REFA
SS
is the reference input for DAC channel B.
DD
DD
) if the V
)
)
and V
SS
, V
to V
REFB
OUTB
DD
OUT
)
. These pins can be tied to
SS
are updated at the same
update is desired at the
to V
OUT
OUTA
DD
). When this pin is
DS22250A-page 17
.
OUTB
, V
OUTB
is the DAC
)