MP7226 Datasheet PDF - Exar Corporation

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MP7226
Exar Corporation

Part Number MP7226
Description Single or Dual Supply 8-Bit Digital-to-Analog Converter
Page 16 Pages


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MP7226
BiCMOS
Fixed, Quad, Voltage Output, Single or Dual
Supply 8-Bit Digital-to-Analog Converter
FEATURES
APPLICATIONS
MPS Pioneered Segmented DAC Approach
Function Generators
Four 8-Bit DACs with Buffer Amplifiers
Automatic Test Equipment
Bipolar Amplifier Inputs for Low Noise and Drift Process Controls
Operates with Single or Dual Supplies
µP Compatible (95ns WR)
BENEFITS
No External Adjustments Required
Power-on-Reset Function
Specified for 5 to 15 V Operation
ESD Protection: 2000 Volts Minimum
Latch-Up Proof
Octal Available: MP7228
Reduced Board Space; Lower System Cost
Reduced System Errors due to Excellent DAC-to-DAC
Matching and Tracking
Easy to Design with Microprocessors
Stable, High Reliability through Advanced Processing
Lower 1/f Noise Increases Useful Dynamic Range
GENERAL DESCRIPTION
The MP7226 contains four 8-bit voltage-output Digital-to-
Analog Converters, with BiCMOS output buffer amplifiers and
interface logic on a monolithic chip. Separate on-chip latches
are provided for each of the four D/A converters. The control
logic is speed compatible with most 8-bit microprocessors. All
digital inputs are TTL/CMOS(5V) compatible.
The MP7226 is manufactured using advanced thin film resis-
tors on a double metal BiCMOS process. The MP7226 incorpo-
rates a unique bit decoding technique yielding lower glitch,
higher speed and excellent accuracy over temperature and
time. The MP7226 maintains 8-Bit accuracy over the full operat-
ing temperature range without laser trim or external adjust-
ments.
SIMPLIFIED BLOCK DIAGRAM
MSB
DATA
(8 BIT)
LSB
WR
D
A
T
A
B
U
S
VREF
VDD
LATCH 1
LATCH 2
DAC 1
DAC 2
+1
+2
LATCH 3
DAC 3
+3
LATCH 4
DAC 4
+4
VOUT1
VOUT2
VOUT3
VOUT4
Rev. 2.00
A1 CONTROL
A0 LOGIC
VSS
AGND
DGND
1



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ORDERING INFORMATION
Package
Type
Temperature
Range
Plastic Dip
Plastic Dip
PLCC
PLCC
SOIC
SOIC
–40 to +85°C
–40 to +85°C
–40 to +85°C
–40 to +85°C
–40 to +85°C
–40 to +85°C
*Contact factory for availability.
Part No.
MP7226KN
MP7226LN*
MP7226KP
MP7226LP*
MP7226KS
MP7226LS*
INL
(LSB)
1
1/2
1
1/2
1
1/2
DNL
(LSB)
1/2
1/2
1/2
1/2
1/2
1/2
Full Scale
Error (LSB)
1
1/2
1
1/2
1
1/2
PIN CONFIGURATIONS See Packaging Section for Package Dimensions
VOUT2
VOUT1
VSS
VREF
AGND
DGND
DB7 (MSB)
DB6
DB5
DB4
1
2
3
4
5
6
7
8
9
10
20 VOUT3
19 VOUT4
18 VDD
17 A0
16 A1
15 WR
14 DB0 (LSB)
13 DB1
12 DB2
11 DB3
1 20
2 19
3 18
4 See 17
5 Pin Out 16
6 at Left 15
7 14
8 13
9 12
10 11
4
5
6
7
8
3 2 1 20 19
See
Pin Out
at Far Left
18
17
16
15
14
9 10 11 12 13
20 Pin PDIP (0.300”)
N20
20 Pin SOIC (Jedec, 0.300”)
S20
20 Pin PLCC
P20
PIN OUT DEFINITIONS
PIN NO. NAME
1 VOUT2
2 VOUT1
3 VSS
4 VREF
5 AGND
6 DGND
7 DB7
8 DB6
9 DB5
10 DB4
DESCRIPTION
DAC 2 Voltage Output
DAC 1 Voltage Output
Negative Power Supply (0 V to –5 V)
Reference Input Voltage
Analog Ground
Digital Ground
Data Input Bit 7 (MSB)
Data Input Bit 6
Data Input Bit 5
Data Input Bit 4
Rev. 2.00
PIN NO. NAME
11 DB3
12 DB2
13 DB1
14 DB0
15 WR
16 A1
17 A0
18 VDD
19 VOUT4
20 VOUT3
DESCRIPTION
Data Input Bit 3
Data Input Bit 2
Data Input Bit 1
Data Input Bit 0 (LSB)
Write (Active Low)
DAC Address Bit 1
DAC Address Bit 0
Positive Power Supply (+5 to +15 V)
DAC 4 Voltage Output
DAC 3 Voltage Output
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MP7226
ELECTRICAL CHARACTERISTICS
Single or Dual Supply Operation (VDD = +10.8 V to 16.5 V, VSS = 0 V or –5 V 10%, AGND = 0 V,
DGND = 0 V, VREF = +2 V to +10 V, RL = 2k, CL = 100pF unless otherwise noted)
Parameter
25°C
Tmin to Tmax
Symbol Min Typ Max Min Max Units
Test Conditions/Comments
STATIC PERFORMANCE
Resolution (All Grades)
N8
8 Bits
Integral Non-Linearity
(Relative Accuracy)
K
L
INL
LSB
1 1 End Point Linearity Spec
1/2 1/2
Differential Non-Linearity
K
L
DNL
1/2
1/2
3/4
3/4
LSB
All grades monotonic over full
temperature range.
Total Unadjusted Error2
K
L
LSB
VDD = 15 V 10%, VREF = +10 V
2 2
1 1
Full Scale Error3
K
L
1
1/2
1
1/2
LSB
VREF = +10 V typ. Tempco is
5 ppm/°C
Zero Code Error
K
L
20
15
30
20
mV
TA = 25°C typ. Tempco is
30µV/°C
Output Load Resistance
DYNAMIC PERFORMANCE4
2
2 kVOUT = +10 V
Voltage Output Slew Rate
Voltage Output Settling Time
Digital Feedthrough
Digital Crosstalk5
24
2 V/µs
4
5 µs
VREF = +10 V; Settling Time to
1/2 LSB
25 nVs Code transition all 0s to all 1s
VREF = 0 V, WR = VDD
25 nVs Code transition all 0s to all 1s
VREF = +10 V, WR = 0 V
REFERENCE INPUT
Reference Input Range1
Reference Input Resistance
Reference Input Capacitance4
AC Feedthrough
1 10
RIN 2
500
–70
1 10 V
2 k
pF
dB
Limitation: VREF – VSS < 11 V
Min RIN at Code 14910
Occurs when all DACs are loaded
with all 1s
VREF = 10 kHz, 5 V p-p sinewave
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance4
Input Coding
VINH
VINL
ILKG
2.4
2.4 V
0.8 0.8 V
1 1 µA
8 8 pF
VIN = 0 V or VDD
Binary
Rev. 2.00
3



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ELECTRICAL CHARACTERISTICS (CONT’D)
Parameter
25°C
Symbol Min Typ Max
POWER SUPPLY
VDD Range
VSS Range (Dual Supplies)8
IDD
10.8 16.5
0 –5.5
12
ISS (Dual Supplies)
10
Tmin to Tmax
Min Max Units
10.8 16.5 V
0 –5.5 V
14 mA
12
SWITCHING
CHARACTERISTICS4, 6, 7
Address to WR Setup Time, t1
Address to WR Hold Time, t2
Data Valid to WR Setup Time, t3
Data Valid to WR Hold Time, t4
WR Pulse Width, t5
tAS 0
tAH 0
tDS 70
tDH 10
tWR 95
0 ns
0 ns
95 ns
10
120 ns
Test Conditions/Comments
For specified performance
For specified performance
Outputs unloaded;
VIN=VINL or VINH
Outputs unloaded;
VIN=VINL or VINH
NOTES:
1 VOUT must be less than VDD by 3.5 V to ensure correct operation.
2 Total Unadjusted Error includes zero code error, relative accuracy and full-scale error.
3 Calculated after zero code error has been adjusted out.
4 Sample tested at 25°C to ensure compliance.
5 The glitch impulse transferred to the output of one converter (not adjusted) due to a change in the digital input code to another
addressed converter.
6 All input rise and fall times are measured from 10% to 90% of +5 V, tR = tF = 5 ns.
7 Timing measurement reference level is (VINH + VINL)/2.
Specifications are subject to change without notice
Rev. 2.00
4



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MP7226 Single or Dual Supply 8-Bit Digital-to-Analog Converter MP7226
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