19-1140; Rev 0; 9/96
Low-Power, +2.5V to +5.5V, 8-Bit
Voltage-Output DAC in µMAX
_______________General Description
The MAX550B serial, 8-bit, voltage-output, digital-to-
analog converter (DAC) operates on a single +2.5V to
+5.5V supply. Its ±1LSB TUE specification is guaran-
teed over temperature. Operating current (supply cur-
rent plus reference current) is typically 75µA with V
DD
=
2.5V and less than 1µA in shutdown mode. The refer-
ence input is disconnected from the REF pin during
shutdown.
The serial interface operates at clock rates up to 10MHz
and is compatible with 3-wire SPI™, QSPI™, and
Microwire™ interface standards.
The MAX550B’s ultra-low power consumption and small
µMAX package make it ideal for portable and battery-
powered applications.
____________________________Features
o
+2.5V to +5.5V Single-Supply Operation
o
±1LSB (max) TUE
o
Low 75µA Operating Current (V
DD
= +2.5V)
o
1µA Shutdown Mode
o
µMAX Package—50% Smaller than 8-Pin SO
o
10MHz, 3-Wire Serial Interface
o
Internal Power-On Reset Clears All Registers
to Zero
MAX550B
_______________Ordering Information
________________________Applications
VCXO Control
Comparator Level Settings
GaAs Amp Bias Control
Digital Gain and Offset Control
PART
MAX550BCPA
MAX550BCUA
MAX550BC/D
MAX550BEPA
MAX550BEUA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 Plastic DIP
8 µMAX
Dice*
8 Plastic DIP
8 µMAX
*Dice are specified at T
A
= +25°C, DC parameters only.
________________Functional Diagram
V
DD1
V
DD2
__________________Pin Configuration
REF
TOP VIEW
DIN
SCLK
CS
OUT 2
CS 3
INPUT
SHIFT
REGISTER
8
DAC
REGISTER
DAC
R-2R LADDER
OUT
GND 1
8
V
DD1
REF
V
DD2
SCLK
MAX550B
7
6
5
MAX550B
DIN 4
GND
DIP/µMAX
SPI and QSPI are registered trademarks of Motorola, Inc.
Microwire is a registered trademark of National Semiconductor Corp.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Low-Power, +2.5V to +5.5V, 8-Bit
Voltage-Output DAC in µMAX
MAX550B
ABSOLUTE MAXIMUM RATINGS
V
DD1,
V
DD2
, SCLK, D
IN
,
CS,
OUT to GND ...............-0.3V to +6V
REF ...........................................................-0.3V to (V
DD_
+ 0.3V)
Maximum Current (any pin) ...............................................50mA
Continuous Power Dissipation (T
A =
+70°C)
Plastic DIP (derate 9.1mW/°C above +70°C) ..............727mW
µMAX (derate 4.1mW/°C above +70°C) ......................330mW
Operating Temperature Ranges
MAX550BBC_A ...................................................0°C to +70°C
MAX550BBE_A ................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
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
DD1 =
V
DD2
= +2.5V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
STATIC PERFORMANCE
Resolution
Differential Nonlinearity
Total Unadjusted Error
Zero-Code Error
Full-Scale Error
REFERENCE INPUT
Reference Input Voltage
Reference Input Resistance
(Note 2)
Reference Input Current
(Note 3)
DAC OUTPUT (OUT)
DAC Output Voltage Swing
DAC Output Resistance
Input High Voltage
Input Low Voltage
Input Current
Input Capacitance (Note 4)
DIGITAL INPUTS (
CS
, SCLK, DIN)
R
OUT
V
IH
V
IL
I
IN
C
IN
V
IN
= 0V or V
DD_
0.7V
DD_
0.3V
DD_
±1
10
0
32
V
REF
V
kΩ
V
V
µA
pF
V
REF
R
REF
I
REF
For specified performance
DAC code = 55 hex
DAC code = 55 hex
V
DD_
= V
REF
= 5.5V
V
DD_
= V
REF
= 2.5V
2.5
32
160
75
275
125
V
DD
V
kΩ
µA
N
DNL
TUE
ZCE
FSE
T
A
= +25°C
Guaranteed
monotonic
MAX550BBC_A/MAX550BBE
MAX550BBEUA (Note 1)
MAX550BBC_A/MAX550BBE
MAX550BBEUA (Note 1)
8
±0.9
±0.9
±1
±1
±1
±1
Bits
LSB
LSB
LSB
LSB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Low-Power, +2.5V to +5.5V, 8-Bit
Voltage-Output DAC in µMAX
MAX550B
ELECTRICAL CHARACTERISTICS (continued)
(V
DD1 =
V
DD2
= +2.5V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DYNAMIC PERFORMANCE
Digital Feedthrough and
Crosstalk
Voltage-Output Settling Time
Voltage-Output Slew Rate
Wake-Up Time
POWER SUPPLIES
Supply Voltage Range
Supply Current
Shutdown Current
V
DD_
I
DD1 +
I
DD2
Output unloaded, all inputs = GND or V
DD
V
DD_
= 5.5V, output unloaded,
all inputs = GND or V
DD_
Shutdown mode
2.5
0.3
0.3
5.5
10
V
µA
µA
SR
CS
= high, all digital inputs from 0V to V
DD_
To ±1/2LSB, C
L
= 20pF
C
L
= 20pF
C
LOAD
= 20pF
V
DD_
= 2.5V
V
DD_
= 5.5V
50
4
1.4
3.1
4
nV-sec
µs
V/µs
µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
Note 2:
Note 3:
Note 4:
0°C to -40°C testing guaranteed by design using six sigma design limits.
Worst-case input resistance at REF occurs at DAC code 55 hex.
Worst-case reference input current occurs at DAC code 55 hex.
Guaranteed by design. Not production tested.
TIMING CHARACTERISTICS (Note 5)
(V
DD1 =
V
DD2
= +2.5V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Digital inputs switching from 0V to V
DD_.
)
PARAMETER
SCLK Pulse Width High
SCLK Pulse Width Low
DIN to SCLK High Setup
DIN to SCLK High Hold
CS
Low to SCLK High Setup
CS
High to SCLK High Setup
SCLK High to
CS
Low Hold
Delay, SCLK High to
CS
High
CS
Pulse Width High
SCLK Period
V
DD_
High to
CS
Low
SYMBOL
t
CH
t
CL
t
DS
t
DH
t
CSS0
t
CSS1
t
CSH0
t
CSH1
t
CSW
t
CP
Power-on reset delay
V
DD_
= 2.5V
V
DD_
= 5.5V
V
DD_
= 2.5V
V
DD_
= 5.5V
CONDITIONS
MIN
40
40
30
0
10
30
30
20
10
20
40
80
5
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
Note 5:
Guaranteed by design. Not production tested.
_______________________________________________________________________________________
3
Low-Power, +2.5V to +5.5V, 8-Bit
Voltage-Output DAC in µMAX
MAX550B
__________________________________________Typical Operating Characteristics
(V
DD1
= V
DD2
= 2.5V, V
REF
= V
DD_
, R
L
= 1MΩ, C
L
= 15pF, T
A
= +25°C, unless otherwise noted.)
OPERATING CURRENT
vs. TEMPERATURE
150.2
OPERATING CURRENT (µA)
149.8
149.4
75.4
75.0
V
DD
_ = V
REF
= 2.5V
DAC CODE = FF hex
1k
10k
100k
FREQUENCY (Hz)
1M
10M
74.6
-60
-20
20
TEMPERATURE (°C)
60
100
V
DD
_ = V
REF
= 5.0V
MAX550 TOC-02
MAX550B-01
REFERENCE FREQUENCY RESPONSE
10
0
RELATIVE OUTPUT (dB)
-10
-20
-30
-40
-50
V
DD_
= 5V
V
REF
= 2Vp-p SINE WAVE
V
DD_
= 2.5V
V
REF
= 100mVp-p SINE WAVE
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX550 TOC-03
REFERENCE AC FEEDTHROUGH
vs. FREQUENCY
MAX550 TOC-04
240
200
OPERATING CURRENT (nA)
160
120
40
36
32
28
-60
V
DD
_ = V
REF
= 2.5V
V
DD
_ = V
REF
= 5.0V
0
RELATIVE OUTPUT (dB)
-20
-40
-60
-80
V
REF
= 1Vp-p SINE WAVE
DAC CODE = 00 hex
-100
-20
20
60
100
10
100
1k
10k
100k
1M
TEMPERATURE (°C)
FREQUENCY (Hz)
4
_______________________________________________________________________________________
Low-Power, +2.5V to +5.5V, 8-Bit
Voltage-Output DAC in µMAX
_____________________________Typical Operating Characteristics (continued)
(V
DD1
= V
DD2
= 2.5V, V
REF
= V
DD_
, R
L
= 1MΩ, C
L
= 15pF, T
A
= +25°C, unless otherwise noted.)
MAX550B
DIGITAL FEEDTHROUGH
MAX550 TOC-07
NEGATIVE SETTLING TIME
DAC CODE FF hex to 00 hex
V
REF
= 2.5V
MAX550 TOC-08
V
REF
= 2.5V
SCLK, 5V/div
OUT, 1V/div
OUT, 50mV/div
CS, 5V/div
200ns/div
2µs/div
OUTPUT GLITCH FILTERING
MAX550 TOC-05
POSITIVE SETTLING TIME
DAC CODE 00 hex to FF hex
V
REF
= 2.5V
MAX550 TOC-06
CODE = 00 hex
V
DD_
= V
REF
= 2.5V
OUT, 50mV/div, C
L
= 0pF
OUT, 50mV/div, C
L
= 100pF
OUT, 50mV/div, C
L
= 220pF
OUT, 50mV/div, C
L
= 1000pF
CS, 5V/div
OUT, 1V/div
CS, 5V/div
5µs/div
2µs/div
_______________________________________________________________________________________
5
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