19-1720; Rev 0; 4/00
Dual, 8-Bit, Voltage-Output
Serial DAC in 8-Pin SOT23
General Description
The MAX5222 contains two 8-bit, buffered, voltage-out-
put digital-to-analog converters (DAC A and DAC B) in a
small 8-pin SOT23 package. Both DAC outputs can
source and sink 1mA to within 100mV of ground and
V
DD
. The MAX5222 operates with a single +2.7V to
+5.5V supply.
The device uses a 3-wire serial interface, which oper-
ates at clock rates up to 25MHz and is compatible with
SPI™, QSPI™, and MICROWIRE™ interface standards.
The serial input shift register is 16 bits long and con-
sists of 8 bits of DAC input data and 8 bits for DAC
selection and shutdown control. DAC registers can be
loaded independently or in parallel at the positive edge
of CS.
The MAX5222’s ultra-low power consumption and tiny
8-pin SOT23 package make it ideal for portable and
battery-powered applications. Supply current is less
than 1mA and drops below 1µA in shutdown mode. In
addition, the reference input is disconnected from the
REF pin during shutdown, further reducing the system’s
total power consumption.
Features
o
Operates from a Single +2.7V to +5.5V Supply
o
Tiny 8-Pin SOT23 Package (3mm
✕
3mm)
o
Dual Buffered Voltage Output
o
Low Power Consumption
0.4mA Operating Current
<1µA Shutdown Current
o
Programmable Shutdown Mode
o
25MHz, 3-Wire Serial Interface
o
SPI, QSPI, and MICROWIRE Compatible
MAX5222
Ordering Information
PART
MAX5222EKA-T
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
8 SOT23-8
________________________Applications
Digital Gain and Offset Adjustment
Programmable Current Source
Programmable Voltage Source
Power-Amp Bias Control
VCO Tuning
SCLK
4
8 DIN
0.22µF
Functional Diagram
0.1µF
(OPTIONAL)
3 V
DD
7 REF
Pin Configuration
TOP VIEW
16-BIT SHIFT REGISTER
CONTROL (8)
DATA (8)
OUTA V
OUTA
DAC
LATCH
A
DAC A
5
DAC
LATCH
B
DAC B
OUTB V
OUTB
6
CS
1
GND
2
V
DD
3
SCLK
4
8
DIN
REF
OUTB
OUTA
MAX5222
7
6
5
CS
1
MAX5222
2 GND
SOT23-8
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________
Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Dual, 8-Bit, Voltage-Output
Serial DAC in 8-Pin SOT23
MAX5222
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ............................................................. -0.3V to +6V
All Other Pins to GND (Note 1).................. -0.3V to (V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SOT23 (derate 8.7mW/°C above +70°C)............696mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
The outputs may be shorted to V
DD
or GND if the package power dissipation is not exceeded. Typical short-circuit current to
GND is 70mA.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +5.5V, REF = V
DD
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
STATIC PERFORMANCE
Resolution
Differential Nonlinearity
Integral Nonlinearity
Total Unadjusted Error
Zero-Code Offset
Zero-Code Temperature
Coefficient
Power-Supply Rejection Ratio
REFERENCE INPUT
Reference Input Voltage Range
Reference Input Capacitance
Reference Input Resistance
Reference Input Resistance
(Shutdown Mode)
DAC OUTPUTS
Output Voltage Range
Capacitive Load at OUT_
Output Resistance
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
Input Current
Input Capacitance
V
IH
V
IL
I
IN
C
IN
V
IN
= 0 or V
DD
(Note 4)
0.1
0.7 x V
DD
0.3 x V
DD
±10
10
V
V
µA
pF
50
0
REF
100
V
pF
Ω
R
REF
(Note 3)
8
GND
25
16
2
V
DD
V
pF
kΩ
MΩ
N
DNL
INL
TUE
V
ZS
TC
VZS
PSRR
4.5V
≤
V
DD
≤
5.5V, V
REF
= 4.096V
2.7V
≤
V
DD
≤
3.6V, V
REF
= 2.4V
Guaranteed monotonic
(Note 2)
(Note 2)
8
±0.3
±0.3
±1
10
100
0.15
0.5
±1
±1
Bits
LSB
LSB
LSB
mV
µV/°C
mV/V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Dual, 8-Bit, Voltage-Output
Serial DAC in 8-Pin SOT23
MAX5222
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.5V, REF = V
DD
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DYNAMIC PERFORMANCE
Voltage-Output Slew Rate
Voltage-Output Settling Time
Digital Feedthrough
and Crosstalk
POWER SUPPLY
Supply Voltage Range
Supply Current
Shutdown Supply Current
V
DD
I
DD
All inputs = 0
V
DD
= 5.5V
V
DD
= 5.5V
V
DD
= 3.6V
2.7
0.55
0.38
0.1
5.5
1
0.8
V
mA
µA
SR
C
L
= 100pF
To ±
1
⁄
2
LSB, C
L
= 100pF
All 0s to all 1s
1
10
0.25
V/µs
µs
nV-s
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TIMING CHARACTERISTICS
(Figure 3, V
DD
= +2.7V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 4)
PARAMETER
SERIAL INTERFACE TIMING
––
—
CS Fall to SCLK Rise Setup Time
––
—
SCLK Rise to CS Rise Setup Time
DIN to SCLK Rise Setup Time
DIN to SCLK Rise Hold Time
SCLK Pulse Width High
SCLK Pulse Width Low
––
—
CS Pulse Width High
SYMBOL
t
CSS
t
CSH
t
DS
t
DH
t
CH
t
CL
t
CSPWH
CONDITIONS
MIN
50
50
20
20
20
20
50
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
Note 2:
Reduced digital code range (code 24 through code 232) is due to swing limitations of the output amplifiers. See
Typical
Operating Characteristics.
Note 3:
Reference input resistance is code dependent. The lowest input resistance occurs at code 55hex. See the
Reference Input
section.
Note 4:
Guaranteed by design. Not production tested.
_______________________________________________________________________________________
3
Dual, 8-Bit, Voltage-Output
Serial DAC in 8-Pin SOT23
MAX5222
__________________________________________Typical Operating Characteristics
(V
DD
= +3V, T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE vs.
OUTPUT SOURCE CURRENT (V
DD
= 3V)
MAX5222-01
OUTPUT VOLTAGE vs.
OUTPUT SOURCE CURRENT (V
DD
= 5V)
MAX5222-02
OUTPUT VOLTAGE
vs. OUTPUT SINK CURRENT
700
600
OUTPUT VOLTAGE (mV)
MAX5222-03
3.5
3.0
OUTPUT VOLTAGE (V)
2.5
2.0
1.5
1.0
0.5
0
0.001
6
5
OUTPUT VOLTAGE (V)
4
3
2
1
800
500
400
300
200
100
0
0.01
0.1
1
10
100
0
0.0001
0.01
1
100
-100
0.0001
0.001
0.01
0.1
1
10
OUTPUT SOURCE CURRENT (mA)
OUTPUT SOURCE CURRENT (mA)
OUTPUT SINK CURRENT (mA)
INTEGRAL NONLINEARITY
vs. DIGITAL CODE
MAX5222-04
DIFFERENTIAL NONLINEARITY
vs. DIGITAL CODE
MAX5222-05
POSITIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5222-06
0.3
0.2
0.1
0.20
0.15
0.10
0.6
0.5
0.4
DNL (LSB)
INL (LSB)
I
DD
(mA)
0
50
100
150
CODE
200
250
300
0.05
0
-0.05
-0.10
0
-0.1
-0.2
-0.3
0
50
100
150
CODE
200
250
300
0.3
0.2
0.1
0
2
3
4
V
DD
(V)
5
-0.15
-0.20
POSITIVE SUPPLY CURRENT
vs. TEMPERATURE
MAX5222-07
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5222-08
REFERENCE SMALL-SIGNAL
FREQUENCY RESPONSE
MAX5222-09
0.65
0.6
0.5
0.4
5
0
RELATIVE OUTPUT (dB)
-5
-10
-15
-20
-25
0.60
I
DD
(mA)
I
DD
(µA)
0.55
0.3
0.2
0.50
0.45
0.1
0
-50
0
50
100
2
3
4
SUPPLY VOLTAGE (V)
5
6
TEMPERATURE (°C)
0.40
0.1
1
10
100
1000
10,000
FREQUENCY (kHz)
4
_______________________________________________________________________________________
Dual, 8-Bit, Voltage-Output
Serial DAC in 8-Pin SOT23
Typical Operating Characteristics (continued)
(V
DD
= +3V, T
A
= +25°C, unless otherwise noted.)
MAX5222
LARGE-SIGNAL OUTPUT STEP RESPONSE
MAX5222-10
CLOCK FEEDTHROUGH
MAX5222-11
V
REF
= V
DD
= 3V, R
L
= 10kΩ, C
L
= 100pF
CH1
CH1
CS
2V/div
SCLK, 5MHz
0 TO 2.9V
5V/div
CH2
CH2
OUT_
1V/div
CS = HIGH, SCLK = 5MHz
2µs/div
50ns/div
OUT_
10mV/div
AC-COUPLED
POWER-UP OUTPUT GLITCH
MAX5222-12
POWER-UP OUTPUT GLITCH
MAX5222-13
CH1
CH2
100µs/div
V
DD
= CHANGES BETWEEN 0 AND 5V
RAMP TIME IS 10µs
V
DD
1V/div
OUT_
50mV/div
CH1
CH2
2ms/div
V
DD
= CHANGES BETWEEN 0 AND 5V
RAMP TIME IS 1ms
V
DD
1V/div
OUT_
50mV/div
_______________________________________________________________________________________
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