ADC 6 Especificações descarregar pdf (Página 12)

GND

Tdiode_P

Tdiode_N

GND

200k

8 pF

CMO

Enable AC

Coupling

ADC12D1800RF

SNAS518I –JULY 2011–REVISED JANUARY 2014

www.ti.com

Table 2-1. Analog Front-End and Clock Balls (continued)

Ball No. Name Equivalent Circuit Description

Common Mode Voltage Output or Signal Coupling

Select. If AC-coupled operation at the analog

inputs is desired, this pin should be held at logic-

low level. This pin is capable of sourcing/ sinking

up to 100 µA. For DC-coupled operation, this pin

C2 V

CMO

should be left floating or terminated into high-

impedance. In DC-coupled Mode, this pin provides

an output voltage which is the optimal common-

mode voltage for the input signal and should be

used to set the common-mode voltage of the

driving buffer.

Bandgap Voltage Output or LVDS Common-mode

Voltage Select. This pin provides a buffered

version of the bandgap output voltage and is

capable of sourcing / sinking 100 uA and driving a

B1 V

load of up to 80 pF. Alternately, this pin may be

used to select the LVDS digital output common-

mode voltage. If tied to logic-high, the 1.2V LVDS

common-mode voltage is selected; 0.8V is the

default.

External Reference Resistor terminals. A 3.3 kΩ

±0.1% resistor should be connected between

Rext+/-. The Rext resistor is used as a reference

C3/D3 Rext+/-

to trim internal circuits which affect the linearity of

the converter; the value and precision of this

resistor should not be compromised.

Input Termination Trim Resistor terminals. A 3.3

kΩ ±0.1% resistor should be connected between

Rtrim+/-. The Rtrim resistor is used to establish

the calibrated 100Ω input impedance of VinI, VinQ

C1/D2 Rtrim+/- and CLK. These impedances may be fine tuned

by varying the value of the resistor by a

corresponding percentage; however, the tuning

range and performance is not ensured for such an

alternate value.

Temperature Sensor Diode Positive (Anode) and

Negative (Cathode) Terminals. This set of pins is

E2/F3 Tdiode+/-

used for die temperature measurements. It has

not been fully characterized.

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