AD7626 Analog Devices, AD7626 Datasheet - Page 8

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AD7626

Manufacturer Part Number
AD7626
Description
16-Bit, 10 MSPS, PulSAR Differential ADC
Manufacturer
Analog Devices
Datasheet

Specifications of AD7626

Resolution (bits)
16bit
# Chan
1
Sample Rate
10MSPS
Interface
LVDS,Ser
Analog Input Type
Diff-Uni
Ain Range
(2Vref) p-p
Adc Architecture
SAR
Pkg Type
CSP

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AD7626
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 6. Pin Function Descriptions
Pin No.
1
2
3
4
5, 6
7
8, 9
10, 11
12
13
14, 15
16, 17
18
19, 20
21
22
Mnemonic
VDD1
VDD2
CAP1
REFIN
EN0, EN1
VDD2
CNV−, CNV+
D−, D+
VIO
GND
DCO−, DCO+
CLK−, CLK+
VDD2
VDD1
VCM
IN−
P
P
DI
P
Type
P
P
AO
AI/O
DI
DI
DO
P
DO
P
AO
AI
1
Description
Analog 5 V Supply. Decouple the 5 V supply with a 100 nF capacitor.
Analog 2.5 V Supply. Decouple this pin with a 100 nF capacitor. The 2.5 V supply source should
supply this pin first, then be traced to the other VDD2 pins (Pin 7 and Pin 18).
Connect this pin to a 10 nF capacitor.
Prebuffer Reference Voltage. When using the internal reference, this pin outputs the band gap voltage
and is nominally at 1.2 V. It can be overdriven with an external reference voltage such as the ADR280.
In either internal or external reference mode, a 10 μF capacitor is required. If using an external 4.096 V
reference (connected to REF), this pin is a no connect and does not require any capacitor.
Enable. Operates from 2.5 V logic. The logic levels of these pins set the operation of the device as
follows:
EN1 = 0, EN0 = 0: power-down mode.
EN1 = 0, EN0 = 1: external 1.2 V reference applied to the REFIN pin required.
EN1 = 1, EN0 = 0: external 4.096 V reference applied to the REF pin required.
EN1 = 1, EN0 = 1: internal reference and internal reference buffer in use.
Digital 2.5 V Supply. Decouple this pin with a 100 nF capacitor.
Convert Input. These pins act as the conversion control pin. On the rising edge of these pins, the
analog inputs are sampled and a conversion cycle is initiated. CNV+ works as a CMOS input when
CNV− is grounded; otherwise, CNV+ and CNV− are differential LVDS inputs.
LVDS Data Outputs. The conversion data is output serially on these pins.
Input/Output Interface Supply. Use a 2.5 V supply and decouple this pin with a 100 nF capacitor.
Ground. Return path for the 100 nF capacitor connected to Pin 12.
LVDS Buffered Clock Outputs. When DCO+ is grounded, the self-clocked interface mode is selected.
In this mode, the 16-bit results on D are preceded by an initial 0 (which is output at the end of the
previous conversion), followed by a 2-bit header (10) to allow synchronization of the data by the
digital host with extra logic. The 1 in this header provides the reference to acquire the subsequent
conversion result correctly. When DCO+ is not grounded, the echoed-clock interface mode is
selected. In this mode, DCO± is a copy of CLK±. The data bits are output on the falling edge of DCO+
and can be captured in the digital host on the next rising edge of DCO+.
LVDS Clock Inputs. This clock shifts out the conversion results on the falling edge of CLK+.
Analog 2.5 V Supply. Decouple this pin with a 100 nF capacitor.
Analog 5 V Supply. Isolate these pins from Pin 1 with a ferrite bead and decouple them with a 100 nF
capacitor.
Common-Mode Output. When using any reference scheme, this pin produces one-half the voltage
present on the REF pin, which can be useful for driving the common mode of the input amplifiers.
Differential Negative Analog Input. Referenced to and must be driven 180° out of phase with IN+.
NOTES
1. CONNECT THE EXPOSED PAD TO THE GROUND
REFIN
VDD1
VDD2
CAP1
VDD2
CNV–
EN0
EN1
PLANE OF THE PCB USING MULTIPLE VIAS.
1
2
3
4
5
6
7
8
Figure 4. Pin Configuration
(Not to Scale)
Rev. A | Page 8 of 28
PIN 1
INDICATOR
AD7626
TOP VIEW
24
23
22
21
20
19
18
17
GND
IN+
IN–
VCM
VDD1
VDD1
VDD2
CLK+

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