AD5556CRUZ Datasheet, PDF (6/20 Pages) Analog Devices – Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with Four-Quadrant Resistors

AD5546/AD5556
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
D7 1
D6 2
28 V_DD
27 D8
D5 3
26 D9
D4 4
25 D10
D3 5
24 D11
D2 6 _AD5546 23 D12
D1 7 _{TOP VIEW} 22 D13
D0 8 ^{(Not to Scale)} 21 D14
R_OFS 9
R_FB 10
R1 11
20 D15
19 GND
18 RS
R_COM 12
REF 13
17 MSB
16 WR
I_OUT 14
15 LDAC
Figure 4. AD5546 Pin Configuration
Data Sheet
D5 1
D4 2
28 V_DD
27 D6
D3 3
26 D7
D2 4
25 D8
D1 5
24 D9
D0 6 _AD5556 23 D10
NC 7 _{TOP VIEW} 22 D11
NC 8 ^{(Not to Scale)} 21 D12
R_OFS 9
R_FB 10
R1 11
20 D13
19 GND
18 RS
R_COM 12
REF 13
17 MSB
16 WR
I_OUT 14
15 LDAC
NC = NO CONNECT
Figure 5. AD5556 Pin Configuration
Table 3. AD5546 Pin Function Descriptions
Pin No. Mnemonic Description
1 to 8 D7 to D0 Digital Input Data Bits[D7: D0]. The signal level must be ≤ VDD + 0.3 V.
9
ROFS
Bipolar Offset Resistor. Accepts up to ±18 V. In two-quadrant mode, ties to RFB. In four-quadrant mode, ties to R1
and the external reference.
10
RFB
Internal Matching Feedback Resistor. Connects to the output of an external op amp for I-V conversion.
11
R1
Four-Quadrant Resistor R1. In two-quadrant mode, shorts to the REF pin. In four-quadrant mode, ties to ROFS.
12
RCOM
Center Tap Point of Two Four-Quadrant Resistors, R1 and R2. In four-quadrant mode, ties to the inverting node of
the reference amplifier. In two-quadrant mode, shorts to the REF pin.
13
REF
DAC Reference Input in Two-Quadrant Mode and R2 Terminal in Four-Quadrant Mode. In two-quadrant mode, this
pin is the reference input with constant input resistance vs. code. In four-quadrant mode, this pin is driven by the
external reference amplifier.
14
IOUT
DAC Current Output. Connects to the inverting node of an external op amp for I-V conversion.
15
LDAC
Digital Input Load DAC Control. Signal level must be ≤ VDD + 0.3 V.
16
WR
Write Control Digital Input in Active Low. Transfers shift-register data to the DAC register on the rising edge. The
signal level must be ≤ VDD + 0.3 V.
17
MSB
Power-On Reset State. MSB = 0 resets at zero scale; MSB = 1 resets at midscale. The signal level must be
≤ VDD + 0.3 V.
18
RS
Reset in Active Low. Resets to zero scale if MSB = 0, and resets to midscale if MSB = 1. The signal level must be
≤ VDD + 0.3 V.
19
GND
Analog and Digital Grounds.
20 to 21 D15 to D14 Digital Input Data Bits[D15:D14]. The signal level must be ≤ VDD + 0.3 V.
22 to 27 D13 to D8 Digital Input Data Bits[D13:D8]. The signal level must be ≤ VDD + 0.3 V.
28
VDD
Positive Power Supply Input. Specified range of operation: 2.7 V to 5.5 V.
Table 4. AD5556 Pin Function Descriptions
Pin No. Mnemonic Description
1 to 6 D5 to D0 Digital Input Data Bits[D5:D0]. The signal level must be ≤ VDD+0.3 V.
7 to 8 NC
No Connection. The user should not connect anything other than dummy pads on these terminals.
9
ROFS
Bipolar Offset Resistor. Accepts up to ±18 V. In two-quadrant mode, ties to RFB. In four-quadrant mode, ties to R1
and the external reference.
10
RFB
Internal Matching Feedback Resistor. Connects to the output of an external op amp for I-V conversion.
11
R1
Four-Quadrant Resistor R1. In two-quadrant mode, shorts to the REF pin. In four-quadrant mode, ties to ROFS.
12
RCOM
Center Tap Point of Two Four-Quadrant Resistors, R1 and R2. In four-quadrant mode, ties to the inverting node of
the reference amplifier. In two-quadrant mode, shorts to the REF pin.
Rev. D | Page 6 of 20