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DC1216A-A

P1-P3P4-P6
1
dc1216f
DEMO MANUAL DC1216
Description
High Speed ADC
Clock Source
Demonstration circuit 1216 is a low jitter, low noise clock
source for demonstrating high speed ADCs. Each assem-
bly includes
a LDO regulator and a high precision VCXO.
Functionally,
this circuit uses a linear regulator to provide
a clean 5V to a VCXO at a fixed frequency. This VCXO is
capable of providing a signal which is clean enough to
produce data sheet performance from high speed ADCs.
It is designed to have 50Ω output impedance, but has
provision for other termination resistors if needed.
Table 1. DC1216A Variants
DC1216A VARIANTS VCXO PART NUMBER OUTPUT FREQUENCY
DC1216A-A Crystek 601964 100MHz
DC1216A-B Crystek 602017 122.88MHz
DC1216A-C Crystek 602019 80MHz
DC1216A-D Crystek 601964 100MHz
Note: DC1216A-A, DC1216A-B and DC1216A-C are optimized to be used
with the data converter demo boards. The DC1216A-D is optimized to
drive the synthesizer demo boards.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
This circuit also is a model for the clock source of ADCs.
It shows how to properly implement a VCXO correctly to
drive the clock of an ADC. It can be used with a DC1075
to produce lower clock frequencies.
Design files for this circuit board are available at
http://www.
linear.com/demo
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dc1216f
DEMO MANUAL DC1216
Quick start proceDure
SETUP
The DC1216 requires an external voltage of 5V. This volt-
age can
be as high as 9V. The SMA connector should be
connected
to the ADC directly, or through a clock divider
circuit such as the DC1075A. No external filter is required.
CONNECT SMA DIRECTLY TO HIGH
SPEED ADC DEMO BOARD
OUTPUT FREQUENCY
DEPENDENT ON CRYSTAL FREQUENCY
5V TO 9V
3
dc1216f
DEMO MANUAL DC1216
parts List
DEMO BOARD 1216A
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 1 B1 BEAD, 47Ω IMPEDANCE 0603 MURATA, BLM18BB470SN1D
2 1 C1 CAP, TANT, 100µF, 10V, 20% 6032 AVX, TPSC107M010R0200
3 1 C2 CAP, X5R, 1µF, 10V, 10% 0603 AVX, 0603ZD105KAT2A
4 1 C4 CAP, X7R, 0.1µF, 25V, 10% 0603 AVX, 06033C104KAT2A
5 2 C6, C5 CAP, X7R, 0.01µF, 50V, 10% 0603 AVX, 06035C103KAT2A
6 2 E3, E5 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
7 0 E1, E2, E4 (OPT) TESTPOINT, TURRET, 0.094"
8 1 J1 CON, SMA-EDGE, 50Ω, PLUG AMPHENOL, 901-9895-RFX
9 1 J2 AUX POWER CONNECTOR, B03B-PASK JST, B03B-PASK (LF)(SN)
10 2 R1, R2 RES, CHIP, 4.99k, 1/10W, 1% 0603 VISHAY, CRCW06034K99FKEA
11 0 R3, R5 (OPT) RES, 0603
12 1 R6 RES, CHIP, 1k, 1/10W, 5% 0603 VISHAY, CRCW06031K00JNEA
13 1 U1 IC LT1761ES5-3.3, SOT23-S5 LINEAR TECHNOLOGY, LT1761ES5-3.3#PBF
14 4 (STAND-OFF) STAND-OFF, NYLON 0.25" KEYSTONE, 8831(SNAP ON)
15 1 STENCIL STENCIL 1216A
P1-P3P4-P6

DC1216A-A

Mfr. #:
Buy DC1216A-A
Manufacturer:
Analog Devices Inc.
Description:
Clock & Timer Development Tools 100MHz High Speed ADC Clock Source
Lifecycle:
New from this manufacturer.
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