Rainbow-electronics MAX106 Manual de usuario descargar pdf (Pagina 18)

MAX106

±5V, 600Msps, 8-Bit ADC with On-Chip

2.2GHz Bandwidth Track/Hold Amplifier

18 ______________________________________________________________________________________

Offset Adjust

The MAX106 provides an analog input (VOSADJ) to com-

pensate for system offsets. The offset adjust input is a

self-biased voltage divider from the internal +2.5V preci-

sion reference. The nominal open-circuit voltage is one-

half the reference voltage. With an input resistance of

typically 25kΩ, this pin may be driven by an external

10kΩ potentiometer (Figure 11) connected between

REFOUT and GNDI to correct for offset errors. This con-

trol provides a typical ±5.5LSB offset adjustment range.

Clock Operation

The MAX106 clock inputs are designed for either sin-

gle-ended or differential operation (Figure 12) with flexi-

ble input drive requirements. Each clock input is

terminated with an on-chip, laser-trimmed 50Ω resistor

to CLKCOM (clock-termination return). The CLKCOM

termination voltage can be connected anywhere

between ground and -2V for compatibility with standard

ECL drive levels.

The clock inputs are internally buffered with a preampli-

fier to ensure proper operation of the data converter,

even with small-amplitude sine-wave sources. The

MAX106 was designed for single-ended, low-phase-

noise sine-wave clock signals with as little as 100mV

amplitude (-10dBm). This eliminates the need for an

external ECL clock buffer and its added jitter.

Single-Ended Clock Inputs (Sine-Wave Drive)

Excellent performance is obtained by AC- or DC-cou-

pling a low-phase-noise sine-wave source into a single

clock input (Figure 13a, Table 5). For proper DC bal-

ance, the undriven clock input should be externally

50Ω reverse-terminated to GNDI.

Table 4. Ideal Input Voltage and Output Code Results for Differential Operation

-125mV

-125mV + 0.5LSB

11111111 (full scale)+125mV

VIN-

11111111+125mV - 0.5LSB 0

OVERRANGE BIT

+125mV - 0.5LSB

01111111

toggles

10000000

0V 0

00000001-125mV + 0.5LSB 0

+125mV 00000000 (zero scale)-125mV 0

VIN+ OUTPUT CODE

GNDI

10k

POT

REFOUT

VOSADJ

MAX106

Figure 11. Offset Adjust with External 10kΩ Potentiometer

CLK+

CLK INPUTS ARE

ESD PROTECTED

(NOT SHOWN IN THIS

SIMPLIFIED DRAWING).

CLKCOM

CLK-

50Ω

+0.8V

50Ω

GNDI

Figure 12. Simplified Clock Input Structure (Single-Ended/

Differential)

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 30 31

Comentarios a estos manuales

Sin comentarios

Rainbow-electronics MAX106 Manual de usuario Pagina 18

Comentarios a estos manuales

Relacionado con productos y manuales para Sensores Rainbow-electronics MAX106