DAC1408A8Q ,V(cc): +5.5V; 8-bit multiplying D/A converterapplications Mxibility your
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DAC1408A8Q ,V(cc): +5.5V; 8-bit multiplying D/A converterCHARACTERISTICS
DIE SIZE 0.087 X 0.063 inch, 5481 sq. mils
(2.21 X 1.60 mm, 3.54 sq. mm)
1. ..
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DAC1408A8Q
V(cc): +5.5V; 8-bit multiplying D/A converter
DAC-1408A
8-BIT MULTIPLYING
D / A CONVERTER
Etrittiiatiaiiiiiiiittiii,
FEATURES
. Improved Direct Replacement for M01408
. 0.19% Nonlinearity Maximum Over Temperature Range
. Improved Settling Tlme .................................... 250ns, Typ
. Improved Power Consumption ..................... 157mW, Typ
. Compatible with TTL, CMOS Logic
. Standard Supply Voltages +5.0V and -5.0V to -15V
. Output Voltage Swing ................................. +0.5V to -5.0V
. HIgh-Speed Multlplying Input ............................ 4.0mA/us
. Available In Die Form
ORDERING INFORMATION'
RELATIVE PACKAGE OPERATING
ACCURACY CERDIP PLASTIC TEMPERATURE
% FS 16-PIN 16-PIN RANGE
$0.19 DAC1408A-8Q - XIND
10.19 - DAC1408A-8P COM
t Burn-in is available on commercial and industrial temperature range parts in
CerDlP, plastic DIP, and Totan packages. For ordering information, see
PMI's Data Book, Section 2.
GENERAL DESCRIPTION
The DAC-1408A is an 8-bit monolithic multiplying digital-to-
analog converter consisting of a reference current amplifier, R-
2R ladder, and eight high-speed current switches. For many
applications, only a reference resistor and reference voltage
need be added. Improvements in design and processing tech-
niques provide faster settling times combined with lower power
consumption while retaining direct interchangeability with the
M01408 device.
The R-2R ladder divides the reference current into eight binar-
ily-related components which areted to the switches. A remain-
SIMPLIFIED SCHEMATIC
der current equal to the least significant bit is always shunted to
the ground, therefore the maximum output current is 255/256 of
the reference amplifier input current. For example, a full-scale
output current of 1.992mA would result from a reference input
current of 2.0mA.
The DAC-1408A is useful in a wide variety of applications, in-
cluding waveform synthesizers, digitally programmable gain
and attenuation blocks, CRT character generation, audio digit-
izing and decoding, stepping motor drives, programmable
power supplies and in building tracking and successive approxi-
mation analog-to-digital converters.
For significantly improved speed and applications flexibility your
attention is directed to the DAC-08 8-bit high-speed multiplying
D/A converter data sheet. For D/A converters, which include
precision voltage references on the chip, please refer to the
DAC-210 or the DAC-100 data sheet.
PIN CONNECTIONS
N.C. COMPENSATION
GND 2,' VREFH
VEE II VREFM
Vcc 16-PIN DUAL-IN-LINE
MSB AT 3 A8 LSB PACKAGE
A7 HERMETIC (Q)
A6 EPOXY (P)
MSB LSB
Al A2 A3 A4 A5 A6 A A8
, , T7 T3 T9 T10 T11 T12
CURRENT SWITCHES '-o 'o
H-ZR LADDER BIAS CIRCUIT --<, GND
VREF(')C Jho VCC
REFERENCE
CURRENT
CURRENT
15 SOURCE
VREF(-)o_.. PAIR 16
-o COMPEN
7/89, Rev. B
DIGITAL-TO-ANALOG CONVERTERS
ABSOLUTE MAXIMUM RATINGS (Note 1)
Power Supply Voltage
Vcc .......................................................... V .................. +5. 5Vdc
VEE "_...'.....'...............-....-.-.........-........ -16dNdtt
Digital Input Voltage, V5 through V12 ...................... +5. 5, 0Vdc
Applied Output Voltages" ....................... +0. 5, -5. 2Vdc
Reference Current, I14 q...........................--......................... 5mA
Operating Temperature Range, TA
DAC- 1408A ....._.o............-...-...-. 0°C to +75°C
Junction Temperature (T, ) ............................... -65'C to 150°C
Storage Temperature Range Tstg ................. -65"C to +150°C
Plastic Package Only ................................. -65''C to +125°C
ELECTRICAL CHARACTERISTICS at Vcc = +5Vdc, vEE
otherwise noted. All digital inputs at logic high level.
= -15Vdc, V
DAC-1408A 8-BIT MULTIPLYING D/A CONVERTER
PACKAGE TYPE 81A (Note 2) 916 UNITS
16-Pin Hermetic DIP (Q) 100 16 “CM
16-Pin Plastic DIP (P) 82 39 'thw
NOTES:
1. Absolute maximum ratings apply to both DICE and packaged parts, unless
otherwise noted.
2. 8 A is speefed for worst case mounting conditions, im., 9.IA is specified for
device In socket for CerDIP and P- DIP packages.
m, 4 = 2mA, 0°C s T, s +75°C for DAC-1408A, unless
DAC-1408A
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Relative Accuracy Ierror relative to
Full-Scale Icy
DAC-1508A-B, DAC-1408A-8 - - 10.19
DAC-1408A-7 E, - - t0.39 tyolFS
DAC-1408A-6 - - :0.78
T t _ hi 1 , L B
Séttllng Ime own In /2 s ts TA = +2500 - 250 - ns
vincludes tpurrr
Propagation Delay Time tpLH,1pHL TA = +25°C. Note l, - 30 100 ns
Output Full-Scale Current Drift TClo - t20 - ppm/°C
Digital Input Logic Levels IMSBI
Hi . _ ''t'' 2 - -
igh Level Logic .. Tr, Vdc
Low Level, Logic "1 VIL - g 0.8
_ q IIH High Level, Ve--' 5. OV - 0 0.04
D I t I A
igital npu Current MSB, h Low Level, vu: 0.8V - -t14 -0.8 m
Reference Input Bias Current fin 15 Iss - -1 -3 PA
VEE = Hiv 0 2.0 2.1
Output Current Range OF VEE = -15V 0 2.0 4.2 m
Output Current IO VREF = 2.000V. R14 =1000n 1.9 1.99 2.1 mA
Output Current IOImm‘ All bits tow - 0 4 “A
IRE; = 1mA
IV It I
"1't11/J)e/t'Tecr'C1:',"Ce, Io Vee=-5V -0.6 - +0.5 vo
I r- _ ba A ' Vee----" -5 - +0.5 c
Reference Current Slew Rate SHIRE; - 4 - mA/ps
Outpu1 Qurren ower Supply P8810, - 0.5 2.7 pA/V
Sensitivity
I - +9 + 14
Power Supply Current CC All bits low mA
les - -7,5 -13
VCCR +4.5 55 +5.5
I I T = 25''C
Power Supp y Vo tage VEER A + -4E -15 -16.5 Vdc
All bits low
Ves = HiVdc - 82 135
_ _ vEE = -15Vdc - 157 265
Power Dissipaton Pd All bits high mW
VEE = -5VOc i 70 -
Vee = -15Vdc - 132 -
l, Guaranteed by design.
7/89, Rev. B
DAC-1408A 8-BIT MULTIPLYING D/A CONVERTER
DICE CHARACTERISTICS
DIE SIZE 0.087 X 0.063 inch, 5481 sq. mils
(2.21 X 1.60 mm, 3.54 sq. mm)
4:, 1. N.C. 9. A5
7 l, 2. GROUND 10. M
5 3. VEE 11. A
4. lo 12. A8 (L58)
s. A1 (M58) 13. Vcc
4 6. A2 14. VREF(+)
r. A3 IS. VHEF(_)
, 8. A4 16. COMP
2 3 For additional DICE ordering Information,
refer to 1990/91 Data Book, Section 2.
WAFER TEST LIMITS at V+ = 5V, v- =15V, IRE; = 2mA, TA = 25''C, unless otherwise noted.
DAC-1408A-G
PARAMETER SYMBOL CONDITIONS LIMIT UNITS
Resolution 8 Bits MIN
Monotonicity 8 Bits MIN
Nonlinearity 10.19 %FS MAX
Full-Scale Current Change, IREF =1mA +0.5 V MAX
Output Voltage Compliance Vo <1/2 LSB v- = -5V -0.6 V MIN
v- = -10V -5 V MIN
Full-Scale Current Vs VREF = 2.000V, Ru, Re =1.000kn 2, $0.1 mA MAX
Zero-Scale Current I15 (All Bits Low) 4 " MAX
- = - V 2.1
Output Current Range log V- = lit, " mA MAX
Logic "0" Input Level " 0.8 V MAX
Logic "1" Input Level VIH 2 V MIN
Logic Input Current
Logic "O" IIL Low Level, VIL = -0.8V t 10
Logic "1" I”, High Level, le = 5V +_10 PA MAX
Reference Bias Current I15 -3 pA MAX
1utpu.tfyrrent ower Supp y PSSIO- 2.7 pA/V MAX
Sensitivity
Power Supply Current H + 14
mA MAX
(All Bits Low) l- -13
VCCR +5. $0.5
Power Supply Voltage Range VEER -tth5, -4.5 MAX/MlN
Power Dissipation V- = 5V 135
P mW MA
(All Bits Low) d v- = -15V 265 X
Electrical tests are performed at wafer probe to the limits shown. Due to variations in assembly methods and normal yield loss, yield after packaging is not
guaranteed for standard product dice. Consult factory to negotiate specifications based on dice lot qualification through sample lot assembly and testing.
TYPICAL ELECTRICAL CHARACTERISTICS at V+ = +5V, V-- = -15V, TA = 25° C. We and IOUT connected to ground, and
IREF = 2mA, unless otherwise noted. Output characteristics refer to low only.
DAC-14OBG
PARAMETER SYMBOL CONDITIONS TYPICAL UNITS
Reference Input Slew Rate dI/dt 4 mA/ps
Propagation Delay 1pm, tern. Any Bit 30 ns
Settling Time ts To _1/2 LSB, All Bits Switched 250 ns
ON or OFF
7/89, Rev. B
DIGITAL—TO—ANALOG CONVERTERS
DAC-1408A B-BIT MULTIPLYING D/A CONVERTER
APPLICATIONS
RELATIVE ACCURACY TEST CIRCUIT
--------_-
---.-.-iA2..,
M 12-311 tt TO nov OUTPUT
----_ IN TO A.
" CONVERTER C
---
" ERROR MAX)
-th-T-
-o..A-''.a .
LSB Air Attt At " I
VREF a 2V 0.1;4F
1oo - -
v-ty-iF o.2t,
_ i, oi
-c i o-'.
8-8" --cr- _ -o--,1- nAc-maA '
COUNTER C . "i, --o-
_C k o-
-o--------0---o-
1s " 3 2
T V55:
USE WITH NEGATIVE VREF USE WITH POSITIVE VREF
let: VCC
" nuams 13 R14 le R15
A1 o- M
a s " an
A 0.... A2 o--" HVHEFH’) J1.
A3 o-' A3 o-',
M o-'' DAC-MOSA A4 o-'-'.,
A5 o-d, A5 o--'-'- DAC-uoaA 2
A6 o-le, Att ol-O,
A7 o,'-,) A7 o-ll,
" o- " p..
11-116 7/89, Rev. B
TRANSIENT RESPONSE AND SETTLING
TIME TEST CIRCUIT
+2.0Vdc
DAC-1408A
VEE - -
E0 FOR SETTLING TIME MEASUREMENT
(ALL BITS SWITCHED LOW TO HIGH)
USEWITH CURRENT-TO-VOLTAGE CONVERTING OPAMP
5 " em
A1 '-o VREF
VHEF = 20w:
R14 = R15 = 1.0m
R0 = 5.0m
9 DAC-MOGA
VEE -I-" -
THEORETICAL vo
Vo = “Jail mojy+e+e+e+e+ti+hr+-ta]
ADJUST vac; R15 on no so THAT vo WITH ALL DIGITAL
INPUTS AT HIGH LEVEL IS EQUAL TO 9.961 VOLTS.
vo --i-f, ,4_-21+-1ie1,+i-s+31-2+s-rrA+z-t1i,]
- 10v [rt] 9.961V
GENERAL INFORMATION AND APPLICATION NOTES
REFERENCE AMPLIFIER DRIVE AND COMPENSATION
The reference amplifier provides a voltage at Pin 14 for
converting the reference voltage to a current, and a turn-
around circuit or current mirror for feeding the ladder. The
reference amplifier input current, I14, must always flow into
DAC-1408A &BIT MULTIPLYING D/A CONVERTERS
Pin 14 regardless of the setup method or reference voltage
polarity. Connections for a positive voltage are shown on the
preceding page. The reference voltage source supplies the
full current lu. For bipolar reference signals, as in the
multiplying mode, R15 can be tied to a negative voltage
corresponding to the minimum input level. It is possible to
eliminate R15 with only a small sacrifice in accuracy and
temperature drift.
The compensation capacitor value must be increased with
increases in R14 to maintain proper phase margin; for R14
values of 1 .0, 2.5 and 5.0m. minimum capacitorvalues are 15,
37, and 75pF. The capacitor may be tied to either Vee or
ground, but using VEE increases negative supply rejection.
A negative reference voltage may be used if R14 is grounded
and the reference voltage is applied to R15 as shown. A high
input impedance is the main advantage of this method.
Compensation involves a capacitor to l/EE on Pin 16, using
the values ofthe previous paragraph. The negative reference
voltage must be at least 4.0V above the V55 supply. Bipolar
input signals may be handled by connecting R14to a positive
reference voltage equal to the peak positive input level at
Pin 15.
When a DC reference voltage is used, capacitive bypass to
ground is recommended as a reference voltage. It a well
regulated 5.0V supply, which drives logic is to be used as the
reference, R14 should be decoupled by connecting it to
+5.0V through another resistorand bypassing thejunction of
the two resistors with 0.1 “F to ground. For reference voltages
greater than 5.0V. a clamp diode is recommended between
Pin 14 and ground.
If Pin 14 is driven by a high impedance such as a transistor
current source, none of the above compensation methods
apply and the amplifier must be heavily compensated,
decreasing the overall bandwidth.
OUTPUT VOLTAGE RANGE
The voltage on Pin 4 is restricted to a range of -0.6V to +0.5V
when Vee = -5V due to the current switching methods employed
in the DAC-1408A.
The negative output voltage compliance of the DAC-1408A is
extended to -5.0V where the negative supply voltage is more
than -10V. Using afull-scale currentot1.992mA and load resis-
tor of 2.5kQ between pin 4 and ground will yield a voltage output
of 256 levels between 0 and -4.980V. The value of the load re-
sistor determines the switching time due to increased voltage
swing. Values of FlL up to 5009 do not significantly affect per-
formance but a 2.5m load increases "worstcase' settling time
to I.2ws (when all bits are switched on). Refer to the subsequent
text section of Settling Time for more details on output loading.
OUTPUT CURRENT RANGE
The output current maximum rating of 4.2mA may be used
only for negative supply voltages more negative than -7.0V,
due to the increased voltage drop across the resistors in the
reference current amplifier.
7/89, Rev. B
DIGITAL-TO-ANALOG CONVERTERS
