terminated by a 51

Ω resistor to eliminate line

reflections of the incoming clock. If the CLKIN

BNC input is left floating, this resistor pulls the

converter’s clock input down to ground, thus ac-

tivating its internal oscillator.

Decoupling

T h e CDB5 01 2, CDB5 012A, C D B5014,

CDB5016’s decoupling scheme was designed to

insure accurate evaluation of the converter’s per-

formance independent of the quality of the power

supplies. Each supply is decoupled at the con-

verter with a 10

low frequency noise and a 0.1

tor to handle higher frequencies. The auto-zero-

ing action of the converter’s comparator provides

extremely good power supply rejection at low

frequencies. Depending on the quality of the sys-

tem’s power supplies, the decoupling scheme

could be relaxed in actual use.

COMPONENT LIST

10

Ω resistor

R1, R2

51

Ω resistor

R3

4.7

Ω resistor

R18

1 k

Ω resistor

R9, R14

560

Ω resistor

R17

10 k

Ω resistor

R4, R5, R6, R7, R8, R10, R11, R12, R13

2.43 k

Ω resistor

R19, R20

3.3 k

Ω resistor

R16

240 k

Ω resistor

R21

50 k

Ω potentiometer

R15

50 k

Ω potentiometer

R22

0.068

C14

0.1

C1, C3, C5, C7, C9, C10, C12

10

C2, C4, C6, C8, C11, C13

CS501X/511X A/D converter

U1

1403 2.5V reference

U2

OP07 op amp

U3

2N2907A transistor

Q1

4 pos. SPST DIP switch

SW1

N.O. SPST push-button

SW2

20 pin header

CON1

bulkhead BNC

CON2, CON3, CON4, CON5, CON6

red banana jack

CON7

black banana jack

CON8

green banana jack

CON9

1" 4-40 spacer

POST1, POST2, POST3, POST4, POST5, POST6

3/8" 4-40 screw

SC1, SC2, SC3, SC4, SC5, SC6

CDB5012, CDB5012A, CDB5014, CDB5016

5

DS14DB11