Datasheet

AD8260
Rev. A | Page 7 of 32
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
07192-002
8
7
6
5
1
4
3
2
29303132 28 252627
20
17
18
19
21
22
23
24
VPSR
FDBK
PRAI
VMDO
VPOS
VPOS
TXOP
TXOP
INPN VNEG VNEG TXFB INRN INRP INPP VOCM
14139 121110 15 16
PIN 1
INDICATOR
AD8260
TOP VIEW
(Not to Scale)
VMDO
NOTES
1. THE EXPOSED PAD IS NOT CONNECTED INTERNALLY. FOR INCREASED RELIABILITY OF THE SOLDER JOINTS
AND MAXIMUM THERMAL CAPABILITY, IT IS RECOMMENDED THAT THE PAD BE SOLDERED TO THE GROUND PLANE.
THE GROUND PLANE PATTERN SHOULD INCLUDE A PATTERN OF VIAS TO INNER LAYERS.
TXEN
VMDI
VNCM
VPSB
ENBL
VGAP
VGAN
VNGR
VPSR GNS3 GNS2 GNS1 GNS0
PRAO VNGR
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic Description
1, 19
1
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, 16
1
VNGR Negative Supply for Preamplifier and DGA (Set to −VPOS for Dual Supply; GND for Single Supply).
10, 20
1
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, 22
1
VPOS Positive Supply for Driver Amplifier.
23, 24
1
TXOP Driver Output.
25, 26
1
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.
EPAD Exposed Pad. The exposed pad is not connected internally. For increased reliability of the solder joints and
maximum thermal capability it is recommended that the pad be soldered to the ground plane. The ground plane
pattern should include a pattern of vias to inner layers.
1
Pins with the same name are connected internally.