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Texas Instruments CDC7005 User Manual Download Page 25

Application Level Circuit Diagram

5-3

Application Level Circuit Diagram

Figure 5

−

2. CDC7005 With an Active Loop Filter Using a CDC7005 Integrated OPA

        SPI

PECL_OUT_B
PECL_OUT

V_CTRL

VCXO

CP_OUT

OPA_IP

OPA_IN

OPA_OUT

VCXO_IN
VCXO_IN_B

CTRL_LE

CTRL_DATA

CTRL_CLK

REF_IN

Yn_B

Yn

CDC7005

STATUS_LOCK

STATUS_VCXO

STATUS_REF

Vcc

245.76 MHz; Gain = 26.5kHz/V

Low-Pass Filter

C3

100 nF

R3 

10 K

Ω

R2 

4.7 K

Ω

C2

10 

µ

F

R5

10 K

Ω

R6

10 K

Ω

C3
100 nF

R1

180 

Ω

R

150 

Ω

R

150 

Ω

R

82 

Ω

R

82 

Ω

10 nF

10 nF

C1
100 nF

130 

Ω

V

CC

130 

Ω

V

CC

Summary of Contents for CDC7005

Page 1: ...CDC7005 BGA Package Evaluation Module Manual High Performance Analog CDC 2005 Clock Drivers User s Guide SCAU005C...

Page 2: ...ute a license from TI to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual pro...

Page 3: ...handling or use of the goods Please be aware that the products received may not be regulatory compliant or agency certified FCC UL CE etc Due to the open construction of the product it is the user s r...

Page 4: ...inty as to the load specification please contact a TI field representative During normal operation some circuit components may have case temperatures greater than 45 C The EVM is designed to operate p...

Page 5: ...tation From Texas Instruments CDC7005 Data Sheet SCAS685 Texas Instruments FCC Warning This equipment is intended for use in a laboratory test environment only It generates uses and can radiate radio...

Page 6: ...iv...

Page 7: ...8 3 5 3 3 4 Loop Filter J29 J35 3 5 3 3 5 High Speed Outputs and Inputs J6 J15 and J19 J20 3 5 3 3 6 VCXO Inputs and Outputs J23 J28 3 6 4 Serial Peripheral Interface SPI Software 4 1 4 1 Functional D...

Page 8: ...an Active Loop Filter Using a CDC7005 Integrated OPA 5 3 5 4 CDC7005 With an Active Loop Filter Using OPA341 5 4 6 1 Component View and Silkscreen 6 5 6 2 Top Layer View 6 6 6 3 Bottom Layer View 6 7...

Page 9: ...ve differential LVPECL outputs can be programmed by a serial peripheral interface SPI The SPI allows individual control of the frequency and enable disable state of each output As the system requires...

Page 10: ...B Y3 Y2B Y2 Y1B Y1 Y0B Y0 CP_OUT STATUS_LOCK STATUS_VCXO STATUS_REF OPA_OUT OPA_IN OPA_IP P Divider VI Reference I_REF NRESET NPD PECL Latch PECL Input PECL MUX0 PECL Latch PECL Latch PECL Latch PECL...

Page 11: ...setting the reference clock must be 1 8th of VCXO frequency if VCXO frequency is 245 76 MHz then the reference clock must be 30 72 MHz for locking Connect Y0 Y0B or Y1 Y1B to oscilloscope in order to...

Page 12: ...2 2...

Page 13: ...3 1 EVM Hardware EVM Hardware This chapter discusses the EVM hardware Topic Page 3 1 Board View and Connector Location 3 2 3 2 Connector Description 3 4 3 3 Hardware Configuration 3 4 Chapter 3...

Page 14: ...Board View and Connector Location 3 2 3 1 Board View and Connector Location Figure 3 1 Board View...

Page 15: ...O_IN VCXO_INB input selector VCXO output selector J23 J24 External VCXO_IN VCXO_INB input VCXO output sense J27 External programming interface by parallel port J28 External programming interface by un...

Page 16: ...12 k resistor For default operation the device uses an internal resistor Note In case of low input impedance of the VCXO control voltage input there is a possibility D3 may not turn on to indicate loc...

Page 17: ...at J35 If an external OPA is used it needs to be switched on by connecting J31 For example passive filter operation is provided when pads 1 and 3 of J29 are solder bridged and pads 1 and 3 of J34 are...

Page 18: ...hase depending on the control voltage level coming from loop filter and provide the input clock to the LVPECL block The circuitry lets the user Measure the on board VCXO output from outside on J23 and...

Page 19: ...heral Interface SPI Software Serial Peripheral Interface SPI Software This chapter discusses the serial peripheral interface software Topic Page 4 1 Functional Description 4 2 4 2 Software Installatio...

Page 20: ...k installation is required prior to use See Section 4 2 Software Installation There are several cases where programming is mandatory Using an active loop filter Reference clock and VCXO clock do not h...

Page 21: ...llation Use the following steps to install the SPI control software 1 Run program setup exe in folder Software Programming Software 2 Run program setup exe in folder Software Parallel Port Access 3 Re...

Page 22: ...4 4...

Page 23: ...5 1 Application Level Circuit Diagram Application Level Circuit Diagram This chapter discusses the application level circuit diagram Topic Page 5 1 Application Level Circuit Diagram 5 2 Chapter 5...

Page 24: ...ure 5 1 CDC7005 With a Passive Loop Filter Configuration SPI PECL_OUT_B PECL_OUT V_CTRL VCXO CP_OUT OPA_IP OPA_IN OPA_OUT VCXO_IN VCXO_IN_B CTRL_LE CTRL_DATA CTRL_CLK REF_IN YnB Yn CDC7005 STATUS_LOCK...

Page 25: ...OPA SPI PECL_OUT_B PECL_OUT V_CTRL VCXO CP_OUT OPA_IP OPA_IN OPA_OUT VCXO_IN VCXO_IN_B CTRL_LE CTRL_DATA CTRL_CLK REF_IN Yn_B Yn CDC7005 STATUS_LOCK STATUS_VCXO STATUS_REF Vcc 245 76 MHz Gain 26 5kHz...

Page 26: ...PI PECL_OUT_B PECL_OUT V_CTRL VCXO CP_OUT OPA_IP OPA_IN OPA_OUT VCXO_IN VCXO_IN_B CTRL_LE CTRL_DATA CTRL_CLK REF_IN YnB Yn CDC7005 STATUS_LOCK STATUS_VCXO STATUS_REF Vcc 245 76 MHz Gain 26 5kHz V Low...

Page 27: ...Layout and Schematic Parts List Board Layout and Schematic This chapter contains the parts list board layout and schematic for the CDC7005 EVM Topic Page 6 1 Parts List 6 2 6 2 Board Layout 6 5 6 3 Sc...

Page 28: ...X7R 0402 Panasonic ECJ 0EB1E101K 9 3 C39 C40 C41 Ceramic 10 pF 25 V C0G 0402 Panasonic ECD G0E100C 10 7 C42 C47 C49 C50 C52 C53 C54 0 1 F 16 V film 0805 20 Panasonic ECP U1C104MA5 Must be film cap 11...

Page 29: ...1X 31 1 R6 12 k 1 16W 5 0402 SMD Panasonic ERJ 2GEJ123X 32 10 R7 R8 R11 R12 R15 R16 R19 R20 R23 R24 150 1 16W 1 0402 SMD Panasonic ERJ 2RKF1500X 33 20 R9 R10 R13 R14 R17 R18 R21 R22 R25 R26 R66 R67 R6...

Page 30: ...Parts List 6 4 45a 1 TP1 T point PC WHT Keystone Elec 5012 46 1 U1 CDC7005ZVA Texas Instruments CDC7005ZVAT...

Page 31: ...Schematic Item Qty Reference Designator Part Part Number Note 47 1 U4 SN74LV125 Texas Instruments SN74LV125AD 48 1 U5 OPA341 Texas Instruments OPA341UA 49 1 VCXO1 VCXO_6 Toyocom VCXO 50 4 MP3 Stand of...

Page 32: ...Parts List 6 6 6 2 Board Layout Figure 6 1 Component View and Silkscreen Y4 Y4B Y3B Y3 PWR P1 P2...

Page 33: ...Parts List 6 7 Parts List Board Layout and Schematic Figure 6 2 Top Layer View...

Page 34: ...Parts List 6 8 Figure 6 3 Bottom Layer View...

Page 35: ...Parts List 6 9 Parts List Board Layout and Schematic Figure 6 4 Ground Plane View...

Page 36: ...Parts List 6 10 Figure 6 5 Power Layer View 6 3 Schematic The following page contains the schematic for the CDC7005...

Page 37: ...2 J6 SMA 1 2 3 C35 100n 1 2 R4 750 1 2 C57 10n 1 2 J29 2 1 3 R67 NU 1 2 C63 10n 1 2 R58 130 1 2 VCXO1 VCXO_6 V_CTRL 1 EN 2 GND 3 OUT 4 OUTB 5 VCC 6 C29 10n 1 2 C25 10n 1 2 C21 10n 1 2 R23 150 1 2 J23...

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