ANALOG DEVICES ADCLK905, ADCLK907, ADCLK925 Service Manual

Ultrafast SiGe

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FEATURES

95 ps propagation delay

7.5 GHz toggle rate 60 ps typical output rise/fall 60 fs random jitter (RJ) On-chip terminations at both input pins Extended industrial temperature range: −40°C to +125°C

2.5 V to 3.3 V power supply (V

APPLICATIONS

Clock and data signal restoration and level shifting Automated test equipment (ATE) High speed instrumentation High speed line receivers Threshold detection Converter clocking

GENERAL DESCRIPTION

The ADCLK905 (one input, one output), ADCLK907 (dual one input, one output), and ADCLK925 (one input, two outputs) are ultrafast clock/data buffers fabricated on the Analog Devices, Inc., proprietary XFCB3 silicon germanium (SiGe) bipolar process.

The ADCLK905/ADCLK907/ADCLK925 feature full-swing emi

tter coupled logic (ECL) output drivers. For PECL (positive ECL) operation, bias V For NECL (negative ECL) operation, bias V V

to the negative supply.

EE

The buffers offer 95 ps propagation delay, 7.5 GHz toggle rate,

ps data rate, and 60 fs random jitter (RJ).

10 Gb

The inputs have center tapped, 100 Ω, on-chip termination r

esistors. A V

REF

The ECL output stages are designed to directly drive 800 mV

ach side into 50 Ω terminated to V

e differential output swing of 1.6 V.

The ADCLK905/ADCLK907/ADCLK925 are available in 16-lead LFCS

P packages.

to the positive supply and VEE to ground.

CC

pin is available for biasing ac-coupled inputs.

− VEE)

CC

− 2 V for a total

CC

to ground and

CC

ECL Clock/Data Buffers

ADCLK905/ADCLK907/ADCLK925

TYPICAL APPLICATION CIRCUITS

V

REF

V

T

D

Figure 1. ADCLK905 ECL 1:1 Clock/Data Buffer

V

1

REF

VT1

D1

D2

VT2

V

2

REF

Figure 2. ADCLK907 ECL Dual 1:1 Clock/Data Buffer

V

REF

V

T

D

Figure 3. ADCLK925 ECL 1:2 Clock/Data Fanout Buffer

V

CC

Q

V

EE

V

CC

V

EE

V

EE

V

CC

V

CC

V

EE

Q1

Q2

Q1

Q2

06318-001

06318-002

06318-003

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

ADCLK905/ADCLK907/ADCLK925

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REVISION HISTORY

8/07—Revision 0: Initial Version

Typical Performance Characteristics..............................................8

Applications Information.............................................................. 11

Power/Ground Layout and Bypassing..................................... 11

Output Stages............................................................................... 11

Optimizing High Speed Performance..................................... 11

Buffer Random Jitter.................................................................. 11

Typical Application Circuits ......................................................... 12

Evaluation Board Schematic......................................................... 13

Outline Dimensions....................................................................... 14

Ordering Guide .......................................................................... 14

Rev. 0 | Page 2 of 16

ADCLK905/ADCLK907/ADCLK925

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SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

Typical (Typ) values are given for VCC − VEE = 3.3 V and TA = 25°C, unless otherwise noted. Minimum (Min) and maximum (Max) values are given over the full V

Table 1.

Parameter Symbol Min Typ Max Unit Conditions

DC INPUT CHARACTERISTICS

Input Voltage High Level VIH V Input Voltage Low Level VIL V Input Differential Range VID 0.2 3.4 V p-p −40°C to +85°C

V

Input Capacitance CIN 0.4 pF

Input Resistance, Single-Ended Mode 50 Ω Input Resistance, Differential Mode 100 Ω Input Resistance, Common Mode 50 kΩ Open VT Input Bias Current 20 μA

DC OUTPUT CHARACTERISTICS

Output Voltage High Level VOH V Output Voltage Low Level VOL V Output Voltage Differential VOD 610 1040 mV 50 Ω to (VCC − 2.0 V) Reference Voltage V

Output Voltage (VCC + 1)/2 V −500 μA to +500 μA Output Resistance 250 Ω

AC PERFORMANCE

Propagation Delay tPD 70 95 125 ps VCC = 3.3 V ± 10%,

70 95 125 ps VCC = 2.5 V ± 5%,

Propagation Delay Temperature Coefficient 50 fs/°C Propagation Delay Skew (Output to Output)

ADCLK907

Propagation Delay Skew (Output to Output)

ADCLK925 Propagation Delay Skew (Device to Device) 35 ps VID = 0.5 V Toggle Rate 6 7.5 GHz >0.8 V differential output swing,

6.5 GHz >0.8 V differential output swing,

Random Jitter RJ 60 fs rms VID = 1600 mV, 8 V/ns, V Rise/Fall Time tR/tF 30 85 ps 20%/80% Additive Phase Noise

622.08 MHz −138 dBc/Hz @10 Hz offset

−144 dBc/Hz @100 Hz offset

−152 dBc/Hz @1 kHz offset

−159 dBc/Hz @10 kHz offset

−161 dBc/Hz @100 kHz offset

−161 dBc/Hz >1 MHz offset

122.88 MHz −135 dBc/Hz @10 Hz offset

−145 dBc/Hz @100 Hz offset

−153 dBc/Hz @1 kHz offset

−160 dBc/Hz @10 kHz offset

−161 dBc/Hz @100 kHz offset

−161 dBc/Hz >1 MHz offset

− VEE = 3.3 V ± 10% and TA = −40°C to +125°C variation, unless otherwise noted.

CC

+ 1.6 VCC V

EE

V

EE

0.2 2.8 V p-p 85°C to 125°C

ID

− 1.26 VCC − 0.76 V 50 Ω to (VCC − 2.0 V)

CC

− 1.99 VCC − 1.54 V 50 Ω to (VCC − 2.0 V)

CC

REF

− 0.7 V

CC

15 ps VID = 0.5 V

10 ps VID = 0.5 V

(±1.7 V between input pins)

(±1.4 V between input pins)

V

= V

, VID = 0.5 V p-p

ICM

REF

V

= V

ICM

V

CC

V

CC

, VID = 0.5 V p-p

REF

= 3.3 V ± 10%

= 2.5 V ± 5%

= 1.85 V

ICM

Rev. 0 | Page 3 of 16

ADCLK905/ADCLK907/ADCLK925

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Parameter Symbol Min Typ Max Unit Conditions

POWER SUPPLY

Supply Voltage Requirement VCC − VEE 2.375 3.63 V 2.5 V − 5% to 3.3 V + 10% Power Supply Current Static

ADCLK905

Negative Supply Current I 25 40 mA Positive Supply Current I

48 63 mA ADCLK907

Negative Supply Current I 50 80 mA Positive Supply Current I

96 126 mA ADCLK925

Negative Supply Current I 31 51 mA Positive Supply Current I

77 97 mA Power Supply Rejection Output Swing Supply Rejection

1

Change in TPD per change in VCC.

2

Change in output swing per change in VCC.

1

2

24 mA VCC − VEE = 2.5 V

VEE

V

− VEE = 3.3 V ± 10%

CC

47 mA VCC − VEE = 2.5 V

VCC

V

− VEE = 3.3 V ± 10%

CC

48 mA VCC − VEE = 2.5 V

VEE

V

− VEE = 3.3 V ± 10%

CC

94 mA VCC − VEE = 2.5 V

VCC

V

− VEE = 3.3 V ± 10%

CC

29 mA VCC − VEE = 2.5 V

VEE

V

− VEE = 3.3 V ± 10%

CC

76 mA VCC − VEE = 2.5 V

VCC

V

− VEE = 3.3 V ± 10%

CC

PSR

3 ps/V VCC − VEE = 3.0 V ± 20%

VCC

PSR

26 dB VCC − VEE = 3.0 V ± 20%

VCC

Rev. 0 | Page 4 of 16

ADCLK905/ADCLK907/ADCLK925

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ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

Supply Voltage

VCC − VEE 6.0 V

Input Voltage

D (D1, D2), D (D1, D2)

D1, D2, D1, D2 to VT Pin

(CML or PECL Termination)

D (D1, D2) to D (D1, D2) Maximum Voltage on Output Pins VCC + 0.5 V Maximum Output Current 35 mA Input Termination, VT to D (D1, D2), D (D1, D2) Voltage Reference, V Temperature

Operating Temperature Range, Ambient −40°C to +125°C

Operating Temperature, Junction 150°C

Storage Temperature Range −65°C to +150°C

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

V

REF

V

− 0.5 V to

EE

+ 0.5 V

V

CC

±40 mA

±1.8 V

±2 V

− VEE

CC

THERMAL RESISTANCE

θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages.

Table 3. Thermal Resistance

Package Type θJA Unit

16-lead LFCSP 70 °C/W

ESD CAUTION

Rev. 0 | Page 5 of 16

ANALOG DEVICES ADCLK905, ADCLK907, ADCLK925 Service Manual

FEATURES

APPLICATIONS

GENERAL DESCRIPTION

TYPICAL APPLICATION CIRCUITS

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGS

THERMAL RESISTANCE

ESD CAUTION