DAC888_15 Datasheet, PDF (3/12 Pages) Analog Devices – 8-BIt LevelTriggered Latch

[pMI)
DAC-888 BYTEDAC'" 8-BIT HIGH-SPEED "MICROPROCESSOR COMPATIBLE" MUl TIPl YING D/A CONVERTER
ELECTRICAL CHARACTERISTICS - A.C. PARAMETERS Vs = +5V, -12V, IREF= 2mA, TA= 25°C.
PARAMETER
Settling Time
SYMBOL
ts
CONDITIONS
From CE & WR Negative Level
to :!:1/2LSB, All Bits Switched
ON or OFF, ISee notel
DAC-888E
MIN TYP MAX
300 400
DAC-888F
MIN TYP MAX
300 400
UNITS
ns
Reference Input
Slew Rate
dl/dt
(See Note)
4
8
4
8
mAIlls
Data Input Setup Time
tDS
ISee note)
150
Data Input Hold Time
tDH
ISee note)
10
Chip Enable/Write Pulse Width
tENW
(See note)
250
-¹⁵⁰
ns
- ¹⁰
ns
250
ns
NOTE: Guaranteed by design.
DAC-888 PIN DESCRIPTION
SYMBOL
DBa - DB7
O_CE
. ^{B WR}
S ^{~ 'OUT}
VREF+' VREF-
O _COMP
DESCRIPTION
DATA BIT - Bits 0-7 are digital, active-high inputs. DB7 is assigned as the MSB.
CHIP ENABLE - An active low input control which is the device enable input terminal.
WRITE CONTROL - An active low control which enables the microprocessor to write data to the DAC.
CURRENT OUTPUT - Complementary current outputs, which when added, equal 'FS'
VOLTAGE REFERENCE - Differential inputs that accept a negative, positive, or bipolar input and are used to set IFS'
COMPENSATION - The reference amplifier frequency compensating terminal.
LE _{FUNCTIONAL DIAGRAM AND TIMING DIAGRAM FOR 8-BIT OPERATION}
TE _{TO B.BIT DATA BUS}
PINS 1-8
PIN 17
PIN 16
PINS 13-14
PINS 10-11
PIN 12
'DB7 DB6 DB5 DB4+ DBJ DB2 DB1 DBa'
DATA
INPUT
/w~
DATA VALID~
17
16
-=
2.500kH 10
+5.000V
11
2.5kH
-=
CE
CONTROL & LATCHES
WR
VREF+
'OUT
VREF-
COMP V-
DAC
GND
lOUT
V+
12
15 9
1B
O.Ol"F
-=
-12V
+5V
WR. CE
I
'ENW
tDH:J
14 _lOUT
-=
'S
~
lOUT
lOUT
'/~~
NOTE: IF INPUT DATA CHANGES AFTER (WR. CEO)LOW AND BEFORE (WR' CE)
i HIGH -IDSI,IOUT/IOUT WILL CHANGE. THE LAST DATA BEFORE (WR' CEO)HIGH
- 'DS! WILL BE LATCHED PROVIDED DATAVALIDIS HELD FOR (IDS (MIN) tDH
(MIN))'
I
en
~
~
~
~_>
Z
0_u
c.J
OPERATION TABLE
0
-J
~
Z
~
CE WR OUTPUT
0
I
X NO CHANGE
f-<
I
-J
0
NO CHANGE
~_f-
0
0 UPDATE lATCHES ITRANSPARENT)
--~
----.---
>--<
~
0
11-103
7/89, Rev. B