Texas Instruments TLC2551EVM, Руководство пользователя

Страница: 12 / 22

Analog Interface
1-4
1.4 Analog Interface
The EVM board is designed for easy interfacing to analog sources such as
signal generators and sensors. The buffer amplifier U1 is in a follower
configuration, non-inverting gain of one. Output of this buffer drives the AIN(+)
pin of the DUT through a 33-
W
resistor (R4). If desired, the user can bypass
U1 by connecting pins 1 - 2 of jumper W2. For low level common mode
rejection (< 0.2V P - P) dual input pseudo-differential devices TLC4545,
TLC3545, TLC2555 or TLV2545 can be used, byassing U1.
Table 1 - 6. Analog Input Connector J1
Pin Signal Description
J1.1 AIN0 Analog input signal to the non - inverting input of U1
J1.3 - AIN0 Second input to dual and pseudo differential devices
J1.5 N/C
J1.7 N/C
J1.9 N/C
J1.11 N/C
J1.13 N/C
J1.15 N/C
J1.17 REF+ External refence voltage for the DUT
J1.19 N/C
1.5 Digital Interface
The EVM is designed for easy interfacing to multiple platforms. Samtec part
numbers SSW - 110 - 22 - F - D - VS - K and TSM - 110 - 01 - T - DV - P provide a
convenient 10-pin dual-row header and socket combination at P2. This
header/socket provides access to the digital control and serial data pins for all
10 of the 12-, 14-, and 16-bit ADCs. Consult Samtec at
www.samtec.com
or
1 - 800 - SAMTEC- 9 for a variety of mating connector options.
Table 1 - 7. Digital Connector J2
Pin Number Signal Description
J2.1 CS Chip select – Active low signal, enables data transfer and device configuration
J2.3 CLKXa Serial clock—damped with 33-
W
resistor
J2.5 CLKRa Serial Clock
J2.7 FSXa Frame sync—damped with 33-
W
resistor
J2.9 FSRa Frame sync (see Note)
J2.11 Reserved
J2.13 DXRa Serial data out
J2.15 Reserved
J2.17 Reserved
J2.19 Reserved
Note: When using a single input ADC, TLC4541, TLC3541, TLC2551 or TLV2541, Frame Sync must be held at V
DD
.