Data Sheet
CDK8307
12/13-bit, 20/40/50/65/80MSPS, Eight Channel,
Ultra Low Power ADC with LVDS
FEATURES
n
n
CDK8307
12/13-bit, 20/40/50/65/80MSPS, Eight Channel, Ultra Low Power ADC with LVDS
General Description
The CDK8307 is a high performance low power octal analog-to-digital
converter (ADC). The ADC employs internal reference circuitry, a serial control
interface and serial LVDS output data, and is based on a proprietary structure.
An integrated PLL multiplies the input sampling clock by a factor of 12 or 14,
according to the LVDS output setting. The multiplied clock is used for data
serialization and data output. Data and frame synchronization output clocks are
supplied for data capture at the receiver.
Various modes and configuration settings can be applied to the ADC through
the serial control interface (SPI). Each channel can be powered down inde-
pendently and data format can be selected through this interface. A full chip
idle mode can be set by a single external pin. Register settings determines the
exact function of this external pin.
The CDK8307 is designed to easily interface with field-programmable gate
arrays (FPGAs) from several vendors.
The very low startup times of the CDK8307 allow significant power reduction
in duty-cycled systems, by utilizing the Sleep Mode or Power Down Mode when
the receive path is idle.
20/40/50/65/80MSPS max sampling rate
Low Power Dissipation
– 23mW/channel at 20MSPS
– 35mW/channel at 40MSPS
– 41mW/channel at 50MSPS
– 51mW/channel at 65MSPS
– 59mW/channel at 80MSPS
72.2dB SNR at 8MHz F
IN
0.5μs startup time from Sleep
15μs startup time from Power Down
Internal reference circuitry requires no
external components
Internal offset correction
Reduced power dissipation modes available
– 34mW/channel at 50MSPS
– 71.5dB SNR at 8MHz F
IN
Coarse and fine gain control
1.8V supply voltage
Serial LVDS output
– 12- and 14-bit output available
n
n
n
n
n
n
n
n
n
Block Diagram
RESETN
SCLK
SDATA
AVDD
AVSS
DVDD
DVSS
LVDS
FCLKP
FCLKN
LCLKP
LCLKN
D1N
D1P
D2N
D2P
LVDS
LVDS
CLKP
CLKN
CSN
PD
PLL
Digital
Gain
Digital
Gain
n
Package alternatives
– TQFP-80
– QFN-64
APPLICATIONS
n
n
n
n
Medical Imaging
Wireless Infrastructure
Test and Measurement
Instrumentation
IP2
IN2
IP1
IN1
Serial Control
Interface
ADC
Clock
Input
ADC
•
•
•
IP8
IN8
ADC
•
•
•
Digital
Gain
•
•
•
LVDS
D8N
D8P
Rev 1C
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 - Fax. +1 510 668-7001
Data Sheet
Table of Contents
Features
.................................................................. 1
Applications
............................................................ 1
General Description
................................................ 1
Block Diagram
........................................................ 1
Table of Contents
................................................... 2
Ordering Information
............................................. 3
Pin Configurations
.................................................. 4
Pin Assignments
.................................................. 5-8
Absolute Maximum Ratings
................................... 9
Reliability Information
........................................... 9
ESD Protection
........................................................ 9
Recommended Operating Conditions
.................... 9
Electrical Characteristics
...................................... 10
Electrical Characteristics – CDK8307A
............10-11
Electrical Characteristics – CDK8307B
................ 11
Electrical Characteristics – CDK8307C
............11-12
Electrical Characteristics – CDK8307D
............12-13
Electrical Characteristics – CDK8307E
................ 13
Digital and Timing Electrical Characteristics
..13-14
LVDS Timing Diagrams
......................................... 15
Figure 1. 12-bit Output, DDR Mode
......................... 15
Figure 2. 14-bit Output, DDR Mode
......................... 15
Figure 3. 12-bit Output, SDR Mode
......................... 15
Figure 4. Data Timing
............................................ 15
Serial Interface
..................................................... 16
Timing Diagram .................................................... 16
Figure 5. Serial Port Interface Timing Diagram
..... 16
Table 1. Serial Port Interface Timing Definitions
... 16
Register Initialization ............................................. 16
Serial Register Map
..........................................17-18
Table 2. Summary of Functions Supported
by Serial Interface
................................17-18
Description of Serial Registers
........................18-25
Table 3. Software Reset
......................................... 18
Table 4. Power-Down Modes
.................................. 18
Table 5. LVDS Drive Strength Programmability
......... 19
Table 6. LVDS Output Drive Strength for
LCLK, FCLK, and Data
............................... 19
Table 7. LVDS Internal Termination
Programmability
....................................... 20
Table 8. LVDS Output Internal Termination
.............. 20
Table 9. Analog Input Invert
................................... 20
Table 10. LVDS Test Patterns
.................................. 21
Table 11. Programmable Gain
................................. 21
Table 12. Gain Setting for Channels 1-8
.................. 22
Table 13. LVDS Clock Programmability and
Data Output Modes
................................. 22
Figure 6. Phase Programmability Modes for LCLK
..... 23
Figure 7. SDR Interface Modes
............................... 23
Table 14. Number of Serial Output Bits
................... 23
Figure 8. LVDS Output Timing Adjustment
.............. 24
Table 15. Full Scale Control
.................................... 24
Table 16. Register Values with Corresponding
Charge in Full-Scale Range
...................... 25
Table 17. Clock Frequency
...................................... 25
Table 18. Clock Frequency Settings
......................... 25
Table 19. Performance Control................................
25
Table 20. Performance Control Settings
................... 26
Table 21. External Common Mode Voltage
Buffer Driving Strength
........................... 26
Theory of Operation
............................................. 27
Recommended Usage
........................................... 27
Analog Input
......................................................... 27
Figure 9. Input Configuration Diagram
................ 27
DC-Coupling
.......................................................... 27
Figure 10. DC-Coupled Input
.............................. 27
AC-Coupling
.......................................................... 28
Figure 11. Transformer Coupled Input
................. 28
Figure 12. AC-Coupled Input
.............................. 28
Figure 13. Alternative Input Network
................... 28
Clock Input and Jitter Considerations
...................... 29
Mechanical Dimensions
...................................30-31
QFN-64 Package.................................................... 30
TQFP-80 Package .................................................. 31
CDK8307
12/13-bit, 20/40/50/65/80MSPS, Eight Channel, Ultra Low Power ADC with LVDS
Rev 1C
©2009-2013 Exar Corporation
2/31
Rev 1C
Data Sheet
Ordering Information
Part Number
CDK8307AITQ80
CDK8307AILP64
CDK8307BITQ80
CDK8307BILP64
CDK8307CITQ80
CDK8307CILP64
CDK8307DITQ80
CDK8307DILP64
CDK8307EITQ80
CDK8307EILP64
Speed
20MSPS
20MSPS
40MSPS
40MSPS
50MSPS
50MSPS
65MSPS
65MSPS
80MSPS
80MSPS
Package
TQFP-80
QFN-64
TQFP-80
QFN-64
TQFP-80
QFN-64
TQFP-80
QFN-64
TQFP-80
QFN-64
Pb-Free
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
RoHS Compliant
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Operating Temperature Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Packaging Method
Tray
Tray
CDK8307
12/13-bit, 20/40/50/65/80MSPS, Eight Channel, Ultra Low Power ADC with LVDS
Tray
Tray
Tray
Tray
Tray
Tray
Tray
Tray
Moisture sensitivity level for QFN package is MSL-2A, for TQFP package is MSL-3.
Rev 1C
©2009-2013 Exar Corporation
3/31
Rev 1C
Data Sheet
Pin Configurations
QFN-64
RESETN
SDATA
OVDD
AVDD
AVDD
TP
AVSS
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
AVDD
CLKN
SCLK
CLKP
VCM
CSN
NC
NC
NC
NC
CDK8307
12/13-bit, 20/40/50/65/80MSPS, Eight Channel, Ultra Low Power ADC with LVDS
IP1
IN1
AVSS
IP2
IN2
AVSS
IP3
IN3
AVSS
IP4
IN4
DVSS
PD
DVSS
D1P
D1N
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
30
31
17
18
19
20
21
22
23
24
25
26
27
28
29
32
48
47
46
45
44
IN8
IP8
AVSS
IN7
IP7
AVSS
IN6
IP6
AVSS
IN5
IP5
AVSS
DVSS
DVDD
D8N
D8P
CDK8307
QFN-64
43
42
41
40
39
38
37
36
35
34
33
FCLKP
D2P
D3P
D4P
D5P
D6P
FCLKN
LCLKP
D2N
D3N
D4N
D5N
D6N
D7P
OVDD
AVDD
AVDD
CLKN
SCLK
CLKP
AVSS
AVSS
AVSS
AVSS
AVSS
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
AVDD
IP1
IN1
AVSS
IP2
IN2
AVDD
AVSS
IP3
IN3
AVSS
IP4
IN4
AVDD
DVSS
PD
DVSS
DVSS
LCLKP
LCLKN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
61
TP
AVSS
VCM
CSN
NC
NC
NC
NC
NC
TQFP-80
SDATA
LCLKN
D7N
60
59
58
57
56
55
54
AVDD
IN8
IP8
AVSS
IN7
IP7
AVDD
AVSS
IN6
IP6
AVSS
IN5
IP5
AVDD
DVSS
RESETN
DVSS
DVSS
FCLKN
FCLKP
CDK8307
TQFP-80
53
52
51
50
49
48
47
46
45
44
43
42
41
33
34
35
37
38
39
21
22
23
24
25
26
27
28
29
30
31
32
36
40
Rev 1C
D1P
D2P
D3P
D4P
D5P
D6P
D7P
DVSS
DVSS
D1N
D2N
D3N
D4N
D5N
D6N
D7N
D8P
DVDD
©2009-2013 Exar Corporation
4/31
DVDD
D8N
Rev 1C
Data Sheet
Pin Assignments - QFN
Pin No.
QFN-64
49, 50, 57
3, 6, 9, 37, 40, 43, 46
1
2
4
5
7
8
10
11
38
39
41
42
44
45
47
48
12, 14, 36
35
13
15
16
17
18
19
20
21
22
27
28
29
30
31
32
33
34
23
24
25
AVDD
AVSS
IP1
IN1
IP2
IN2
IP3
IN3
IP4
IN4
IP5
IN5
IP6
IN6
IP7
IN7
IP8
IN8
DVSS
DVDD
PD
D1P
D1N
D2P
D2N
D3P
D3N
D4P
D4N
D5P
D5N
D6P
D6N
D7P
D7N
D8P
D8N
FCLKP
FCLKN
LCLKP
Analog power supply, 1.8V
Analog ground
Positive differential input signal, channel 1
Negative differential input signal, channel 1
Positive differential input signal, channel 2
Negative differential input signal, channel 2
Positive differential input signal, channel 3
Negative differential input signal, channel 3
Positive differential input signal, channel 4
Negative differential input signal, channel 4
Positive differential input signal, channel 5
Negative differential input signal, channel 5
Positive differential input signal, channel 6
Negative differential input signal, channel 6
Positive differential input signal, channel 7
Negative differential input signal, channel 7
Positive differential input signal, channel 8
Negative differential input signal, channel 8
Digital ground
Digital and I/O power supply, 1.8V
Power-down input. Activate after applying power in order to initialize the
ADC correctly. Alternatively use the SPI power down feature.
LVDS channel 1, positive output
LVDS channel 1, negative output
LVDS channel 2, positive output
LVDS channel 2, negative output
LVDS channel 3, positive output
LVDS channel 3, negative output
LVDS channel 4, positive output
LVDS channel 4, negative output
LVDS channel 5, positive output
LVDS channel 5, negative output
LVDS channel 6, positive output
LVDS channel 6, negative output
LVDS channel 7, positive output
LVDS channel 7, negative output
LVDS channel 8, positive output
LVDS channel 8, negative output
LVDS frame clock (1x), positive output
LVDS frame clock (1x), negative output
LVDS bit clock, positive output
Pin Name
Description
CDK8307
12/13-bit, 20/40/50/65/80MSPS, Eight Channel, Ultra Low Power ADC with LVDS
Rev 1C
©2009-2013 Exar Corporation
5/31
Rev 1C
无线连接
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
