AD8260 Datasheet, PDF (7/32 Pages) Analog Devices – High Current Driver Amplifier and Digital VGA/Preamplifier with 3 dB Steps

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
AD8260
VMDO 1
TXEN 2
VMDI 3
VNCM 4
VPSB 5
ENBL 6
VGAP 7
VGAN 8
32 31 30 29 28 27 26 25
PIN 1
INDICATOR
AD8260
TOP VIEW
(Not to Scale)
24 TXOP
23 TXOP
22 VPOS
21 VPOS
20 VPSR
19 VMDO
18 PRAI
17 FDBK
9 10 11 12 13 14 15 16
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic Description
1, 19¹ VMDO
VMID Buffer Output. Requires robust ac decoupling with a capacitance of 0.1 μF capacitor or greater.
2
TXEN
Driver Enable. Logic threshold = 1.1 V with ±0.2 V hysteresis.
3
VMDI
VMID Input Voltage. Normally decoupled with a 0.1 μF capacitor. When pulled to VNCM, the VMID buffer shuts
down. This can be useful when using the part with dual supplies or when an external midpoint generator is used.
4
VNCM
Negative Supply for Bias Cell, VMID Cell, and Logic Inputs. (Ground this pin in applications.)
5
VPSB
Positive Supply for Bias Cell and VMID Cell.
6
ENBL
Enable. Logic threshold = 1.1 V. When low, the AD8260 is disabled and the supply current is 35 μA when TXEN
and all GNSx pins are also low.
7
VGAP
Positive VGA Output (Needs to Be Ac-Coupled for Single Supply).
8
VGAN
Negative VGA Output (Needs to Be Ac-Coupled for Single Supply).
9, 16¹ VNGR
Negative Supply for Preamplifier and DGA (Set to −VPOS for Dual Supply; GND for Single Supply).
10, 20¹ VPSR
Positive Supply for Preamplifier, DGA, and GNSx Logic Decoder.
11
GNS3
MSB for Gain Control. Logic threshold = 1.1 V.
12
GNS2
Gain Control Bit. Logic threshold = 1.1 V.
13
GNS1
Gain Control Bit. Logic threshold = 1.1 V.
14
GNS0
LSB for Gain Control. Logic threshold = 1.1 V.
15
PRAO
Preamplifier Output.
17
FDBK
Negative Input of Preamplifier.
18
PRAI
Positive Input of Preamplifier.
21, 22¹ VPOS
Positive Supply for Driver Amplifier.
23, 24¹ TXOP
Driver Output.
25, 26¹ VNEG
Negative Supply for Driver Amplifier (Set to −VPOS for Dual Supply; GND for Single Supply).
27
TXFB
Feedback for Driver Amplifier.
28
INPN
Negative Driver Amplifier Input.
29
INRN
Negative Gain Resistor Input for Driver Amplifier.
30
INRP
Positive Gain Resistor Input for Driver Amplifier.
31
INPP
Positive Driver Amplifier Input.
32
VOCM
Output Common Mode Pin. Normally connected to Pin VMDO.
1 _{Pins with the same name are connected internally.}
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