Rainbow Electronics MAX5251 User Manual
19-1172; Rev 0; 12/96
+3V, Quad, 10-Bit Voltage-Output DAC
with Serial Interface
__________________General Description
The +3V MAX5251 combines four low-power, voltageoutput, 10-bit digital-to-analog converters (DACs) and
four precision output amplifiers in a space-saving, 20pin package. In addition to the four voltage outputs,
each amplifier’s negative input is also available to the
user. This facilitates specific gain configurations, remote
sensing, and high output drive capacity, making the
MAX5251 ideal for industrial-process-control applications. Other features include software shutdown, hardware shutdown lockout, an active-low reset that clears
all registers and DACs to zero, a user-programmable
logic output, and a serial-data output.
Each DAC has a double-buffered input organized as an
input register followed by a DAC register. A 16-bit serial
word loads data into each input/DAC register. The
3-wire serial interface is compatible with SPI™/QSPI™
and Microwire™. It allows the input and DAC registers to
______________________________Features
♦ Four 10-Bit DACs with Configurable
Output Amplifiers
♦ +3.0V to +3.6V Single-Supply Operation
♦ Low Supply Current: 0.8mA Normal Operation
3µA Shutdown Mode
♦ Available in 20-Pin SSOP
♦ Power-On Reset Clears all Registers and
DACs to Zero
♦ SPI/QSPI and Microwire Compatible
♦ Simultaneous or Independent Control of DACs
via 3-Wire Serial Interface
♦ User-Programmable Digital Output
♦ Schmitt-Trigger Digital Inputs for Direct
Optocoupler Interface
♦ 12-Bit Upgrade Available: MAX5253
be updated independently or simultaneously with a single software command. All logic inputs are TTL/CMOS-
_________________Ordering Information
logic compatible.
________________________Applications
Digital Offset and Gain Adjustment
Microprocessor-Controlled Systems
Industrial Process Controls
Automatic Test Equipment
Remote Industrial Controls
PART
MAX5251ACPP
MAX5251BCPP 0°C to +70°C
MAX5251ACAP
MAX5251BCAP 0°C to +70°C
Ordering Information continued on last page.
Pin Configuration appears at end of data sheet.
TEMP. RANGE PIN-PACKAGE
0°C to +70°C
0°C to +70°C 20 SSOP
20 Plastic DIP
20 Plastic DIP
20 SSOP
INL
(LSB)
±1/2
±1
±1/2
±1
Motion Control
_________________________________________________________________________Functional Diagram
MAX5251
DOUT
CL
16-BIT
SHIFT
REGISTER
SR
CONTROL
DIN
CS
SPI and QSPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.
________________________________________________________________
PDL
DGND
DECODE
CONTROL
LOGIC
OUTPUT
SCLK
UPO REFCD
AGND
INPUT
REGISTER A
INPUT
REGISTER B
INPUT
REGISTER C
INPUT
REGISTER D
V
DD
REGISTER A
REGISTER B
REGISTER C
REGISTER D
DAC
DAC
DAC
DAC
MAX5251
REFAB
DAC A
DAC B
DAC C
DAC D
FBA
OUTA
FBB
OUTB
FBC
OUTC
FBD
OUTD
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
+3V, Quad, 10-Bit Voltage-Output DAC
with Serial Interface
ABSOLUTE MAXIMUM RATINGS
VDDto AGND............................................................-0.3V to +6V
to DGND ...........................................................-0.3V to +6V
V
DD
AGND to DGND..................................................................±0.3V
REFAB, REFCD to AGND...........................-0.3V to (V
OUT_, FB_ to AGND...................................-0.3V to (V
Digital Inputs to DGND.............................................-0.3V to +6V
DOUT, UPO to DGND ................................-0.3V to (V
Continuous Current into Any Pin.......................................±20mA
Continuous Power Dissipation (T
MAX5251
Plastic DIP (derate 8.00mW/°C above +70°C).................640mW
SSOP (derate 8.00mW/°C above +70°C) ......................640mW
CERDIP (derate 11.11mW/°C above +70°C).................889mW
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.
= +70°C)
A
DD
DD
DD
+ 0.3V)
+ 0.3V)
+ 0.3V)
ELECTRICAL CHARACTERISTICS
(VDD= +3.0V to +3.6V, AGND = DGND = 0V, REFAB = REFCD = 1.25V, RL= 5kΩ, CL= 100pF, TA= T
noted. Typical values are at T
STATIC PERFORMANCE—ANALOG SECTION
Integral Nonlinearity
(Note 1)
Offset Error
REFERENCE INPUT
MATCHING PERFORMANCE (TA= +25°C)
Reference Input Range
Reference Input Resistance
= +25°C. Output buffer connected in unity-gain configuration (Figure 9).)
A
MAX5251AC/E
INL
REF
REF
MAX5251BC/E
MAX5251BMJP ±2.0
Guaranteed monotonic
OS
VDD= +3.0V to +3.6V
Code dependent, minimum at code 554 hex
Operating Temperature Ranges
MAX5251_C_P......................................................0°C to +70°C
MAX5251_E_P ...................................................-40°C to +85°C
MAX5251BMJP................................................-55°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
to T
MIN
CONDITIONS
±0.25 ±0.5
, unless otherwise
MAX
±1.0
±6.0 mVV
- 1.4V
DD
UNITSMIN TYP MAXSYMBOLPARAMETER
Bits10NResolution
LSB
LSB±1.0DNLDifferential Nonlinearity
ppm/°C6Offset-Error Tempco
LSBGEGain Error (Note 1) ±2.4
ppm/°C1Gain-Error Tempco
µV/VPSRRPower-Supply Rejection Ratio 100 800
kΩ10R
V0V
2 _______________________________________________________________________________________
+3V, Quad, 10-Bit Voltage-Output DAC
with Serial Interface
ELECTRICAL CHARACTERISTICS (continued)
(VDD= +3.0V to +3.6V, AGND = DGND = 0V, REFAB = REFCD = 1.25V, RL= 5kΩ, CL= 100pF, TA= T
noted. Typical values are at T
MULTIPLYING-MODE PERFORMANCE
Signal-to-Noise Plus
Distortion Ratio
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
DIGITAL OUTPUTS
Output High Voltage
Output Low Voltage
DYNAMIC PERFORMANCE
Output Voltage Swing
OUT_ Leakage Current
in Shutdown
Start-Up Time Exiting
Shutdown Mode
POWER SUPPLIES
Supply Voltage
Supply Current
= +25°C. Output buffer connected in unity-gain configuration (Figure 9).)
A
CONDITIONS
V
= 0.67Vp-p
REF
Input code = all 0s, V
V
= 1Vp-p at 25kHz, code = full scale
REF
IH
IL
VIN= 0V or V
IN
IN
I
OH
OL
DD
DD
SOURCE
I
= 2mA
SINK
To ±1/2LSB, V
Rail-to-rail (Note 2)
RL= ∞
CS = VDD, DIN = 100kHz
(Note 3)
(Note 4)
(Note 4) µA320Supply Current in Shutdown
DD
= 2mA
STEP
REF
= 1.25V
= 1.6Vp-p at 1kHz dB-84Reference Feedthrough
MIN
to T
, unless otherwise
MAX
DD
MAX5251
UNITSMIN TYP MAXSYMBOLPARAMETER
kHz650Reference -3dB Bandwidth
dB72SINAD
V2.0V
V0.6V
µA0.01 ±1.0I
pF8C
VVDD- 0.5V
V0.13 0.4V
V/µs0.6SRVoltage Output Slew Rate
µs12Output Settling Time
V0 to V
µA0 0.1Current into FB_
µA0.01 ±1
µs20
nV-s5Digital Feedthrough
nV-s5Digital Crosstalk
V3.0 3.6V
mA0.82 0.98I
µA0.01 ±1Reference Current in Shutdown
Note 1: Guaranteed from code 5 to code 1023 in unity-gain configuration.
Note 2: Accuracy is better than 1LSB for V
Note 3: Remains operational with supply voltage as low as +2.7V.
Note 4: R
= ∞, digital inputs at DGND or VDD.
L
_______________________________________________________________________________________ 3
= 6mV to VDD- 80mV, guaranteed by PSR test at the endpoints.
OUT
+3V, Quad, 10-Bit Voltage-Output DAC
with Serial Interface
ELECTRICAL CHARACTERISTICS (continued)
(VDD= +3.0V to +3.6V, AGND = DGND = 0V, REFAB = REFCD = 1.25V, RL= 5kΩ, CL= 100pF, TA= T
noted. Typical values are at T
TIMING CHARACTERISTICS (Figure 6)
SCLK Clock Period
SCLK Clock Period
SCLK Pulse Width High
MAX5251
SCLK Pulse Width Low
CS Fall to SCLK Rise Setup Time
SCLK Rise to CS Rise Hold Time
DIN Setup Time
DIN Hold Time
SCLK Rise to DOUT Valid
Propagation Delay
SCLK Fall to DOUT Valid
Propagation Delay
SCLK Rise to CS Fall Delay
CS Rise to SCLK Rise Hold Time
CS Pulse Width High
= +25°C. Output buffer connected in unity-gain configuration (Figure 9).)
A
CONDITIONS
CP
CP
CH
CL
CSS
CSH
DS
DH
t
D01
t
D02
CS0
CS1
CSW
CL= 200pF
CL= 200pF
MIN
to T
, unless otherwise
MAX
UNITSMIN TYP MAXSYMBOLPARAMETER
ns100t
ns100t
ns40t
ns40t
ns40t
ns0t
ns40t
ns0t
120
ns
120 ns
ns40t
ns40t
ns100t
__________________________________________Typical Operating Characteristics
(V
= +3.3V, TA = +25°C, unless otherwise noted.)
DD
INTEGRAL NONLINEARITY
vs. REFERENCE VOLTAGE
0.25
0
-0.25
-0.50
INL (LSB)
-0.75
-1.00
RL = 5kΩ
-1.25
0 0.5 1.0 1.5 2.0
REFERENCE VOLTAGE (V)
MAX5251-01
-12
RELATIVE OUTPUT (dB)
-16
-20
2.5
REFERENCE VOLTAGE INPUT
FREQUENCY RESPONSE
0
-4
-8
0 500k 1.0M 1.5M 2.0M 2.5M 3.0M
REFAB SWEPT 0.67Vp-p
RL = 5kΩ
CL = 100pF
FREQUENCY (Hz)
MAX5251-06
1000
950
900
850
800
750
700
650
SUPPLY CURRENT (µA)
600
550
500
-55 -40 -20 0 20 40 60 80 120100
4 _______________________________________________________________________________________
SUPPLY CURRENT
vs. TEMPERATURE
CODE = FFC hex
TEMPERATURE (°C)
MAX5251-04
+3V, Quad, 10-Bit Voltage-Output DAC
with Serial Interface
____________________________Typical Operating Characteristics (continued)
(V
= +3.3V, TA = +25°C, unless otherwise noted.)
DD
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1000
950
900
850
800
750
700
650
SUPPLY CURRENT (µA)
600
550
CODE = FFC hex
500
2.7 2.8 3.02.9 3.1 3.2 3.3 3.4 3.6
SUPPLY VOLTAGE (V)
0
-0.5
-1.0
0.50
0.45
MAX5251-05
0.40
0.35
0.30
0.25
0.20
THD + NOISE (%)
0.15
0.10
0.05
3.5
0
FULL-SCALE ERROR
vs. LOAD
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
DAC CODE = FULL SCALE
REFAB = 1Vp-p
= 5kΩ
R
L
= 100pF
C
L
0.1 1 10 100
FREQUENCY (kHz)
REFERENCE FEEDTHROUGH
0
MAX5251-03
-20
-40
0
MAX5251-02
-20
-40
-60
SIGNAL AMPLITUDE (dB)
-80
-100
0.5 1.6 3.8
AT 1kHz
REFAB INPUT SIGNAL
V
= 1.6Vp-p @ 1kHz
REF
= 5kΩ
R
L
= 100pF
C
L
OUTPUT FFT PLOT
V
= 1kHz, 0.006V TO 1.6V
REF
= 5kΩ
R
L
= 100pF
C
L
2.7 4.9 6.0
FREQUENCY (kHz)
MAX5251-11
MAX5251
MAX5251-10
-1.5
FULL-SCALE ERROR (LSB)
-2.0
-2.5
0.01 0.1 1 10 100
LOAD (kΩ)
-60
SIGNAL AMPLITUDE (dB)
-80
-100
0.5 1.2 2.6
OUTA FEEDTHROUGH
FREQUENCY (kHz)
1.9 3.3 4.0
_______________________________________________________________________________________ 5
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