MAX5222EKA+T Maxim Integrated Products, MAX5222EKA+T Datasheet - Page 8

• Manufacturer Part Number: MAX5222EKA+T
• Description: IC DAC 8BIT DUAL BUFF SOT23-8
• Manufacturer: Maxim Integrated Products

Specifications of MAX5222EKA+T

• Settling Time: 10µs
• Number Of Bits: 8
• Data Interface: Serial
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-8
• Resolution: 8 bit
• Interface Type: Serial (SPI)
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Voltage Reference: External
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: MAX5222EKA+T

An active-low chip select (
to receive data from the serial data input. Data is
clocked into the shift register on every rising edge of
the serial clock signal (SCLK). The clock frequency can
be as high as 25MHz.
Data is sent most significant bit (MSB) first and can be
transmitted in one 16-bit word. The write cycle can be
segmented when
example, two 8-bit-wide transfers. After clocking all 16
bits into the input shift register, the rising edge of
updates the DAC outputs and the shutdown status.
Because of their single buffered structure, DACs cannot
be simultaneously updated to different digital values.
Dual, 8-Bit, Voltage-Output
Serial DAC in 8-Pin SOT23
Figure 1. DAC Simplified Circuit Diagram
8
GND
SHOWN FOR ALL 1s ON DAC
REF
_______________________________________________________________________________________
2R
2R
R
–
C
—
S
–
is kept active (low) to allow, for
2R
R
–
C
—
S
–
) enables the shift register
2R
R
Serial Interface
2R
OUT
C
–
—
S
–
Table 2 lists the serial-input data format. The 16-bit
input word consists of an 8-bit control byte and an 8-bit
data byte. The 8-bit control byte is not decoded inter-
nally. Every control bit performs one function. Data is
clocked in starting with UB1 (uncommitted bit), followed
by the remaining control bits and the data byte. The
least significant bit (LSB) of the data byte (B0) is the
last bit clocked into the shift register (Figure 2).
Table 3 is an example of a 16-bit input word. It per-
forms the following functions:
• 80 hex (128 decimal) loaded into DAC registers
• DAC A and DAC B are active.
Table 1. Input Shift Register
*Clocked in last.
**Clocked in first.
A and B.
Serial-Input Data Format and Control Codes
UB1**
UB4
UB3
UB2
B0*
B1
B2
B3
B4
B5
B6
B7
LA
LB
SA
SB
DAC Data Bit 0 (LSB)
DAC Data Bit 1
DAC Data Bit 2
DAC Data Bit 3
DAC Data Bit 4
DAC Data Bit 5
DAC Data Bit 6
DAC Data Bit 7 (MSB)
Load Reg DAC A, Active High
Load Reg DAC B, Active High
Uncommitted Bit 4
Shut Down, Active High
Shut Down, Active High
Uncommitted Bit 3
Uncommitted Bit 2
Uncommitted Bit 1