U4256BM
Rev. A5, 06-Oct-00
Preliminary Information
4 (14)
Electrical Characteristics (continued)
Test conditions (unless otherwise specified): V
S
= +8.5 V, T
amb
= +25°C
Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit
Pulsed current output PD Pin 2
Output current Bit 71, 70 = ‘00’ PD = 2.5 V ± IPD 20 25 30 µA
Output current Bit 71, 70 = ‘001’ 80 100 120 µA
Output current Bit 71, 70 = ‘10’ 400 500 600 µA
Output current Bit 71, 70 = ‘11’ 1600 2000 2400 µA
Leakage current PD = 2.5 V ± IPDL 20 nA
PDO Pin 1
Saturation voltage HIGH
LOW
I = 15 mA V
PDOH
V
PDOL
0.1 0.2
V
S
– 0.5
0.4
V
V
SWO1, SWO2, SWO3, SWO4 (open drain) Pins 7, 8, 9 and 10
Output leakage current
HIGH
V7,8,9,10 = 8.5 V I
SWOH
100 nA
Output voltage LOW I = 1 mA V
SWOL
100 400 mV
DAC1, DAC2 Pins 3 and 4
Output current I
DAC1,
2
± 1 mA
Output voltage V
DAC1,
2
0.3 V
S
– 0.5 V
Gain range (resolution 256 steps) 0.6 2.3
Offset range (resolution 24 steps) –0.6 0.7 V
DAC 3 Pin 5
Output current I
DAC3
± 1 mA
Output voltage (resolution 16 steps) V
DAC3
0.25 6 V
3-Wire Bus Description
12
24-bit command
16-bit command
DATA
CLK
LSB LSBMSB MSBBYTE 1 BYTE 2
ENEN
CLK
DATA
LSB
LSB
MSB
MSB BYTE 3BYTE 2 MSBLSBBYTE 1
EN
e.g., Divider
0
02
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
2
10
2
11
2
2
13
IPD
P–2
1
R–Divider Addr.
P–2
0
P–2
2
Status 0
OSCB
2
14
2
15
DAC3
Figure 3. Pulse diagram
