LTC2351HUH-14#PBF Linear Technology, LTC2351HUH-14#PBF Datasheet - Page 18

• Manufacturer Part Number: LTC2351HUH-14#PBF
• Description: IC ADC 14BIT 1.5MSPS 32-QFN
• Manufacturer: Linear Technology

Specifications of LTC2351HUH-14#PBF

• Number Of Bits: 14
• Sampling Rate (per Second): 1.5M
• Data Interface: Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 16.5mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LTC2351-14
APPLICATIONS INFORMATION
HARDWARE INTERFACE TO TMS320C54x
The LTC2351-14 is a serial output ADC whose interface
has been designed for high speed buffered serial ports in
fast digital signal processors (DSPs). Figure 7 shows an
example of this interface using a TMS320C54X.
The buffered serial port in the TMS320C54x has direct
access to a 2kB segment of memory. The ADC’s serial
data can be collected in two alternating 1kB segments,
in real time, at the full 1.5Msps conversion rate of the
LTC2351-14. The DSP assembly code sets frame sync
mode at the BFSR pin to accept an external positive going
18
LTC2351-14
OGND
DGND
CONV
OV
SDO
SCK
DD
3
30
32
1
2
31
3V
Figure 7. DSP Serial Interface to TMS320C54x
CONV
CLK
0V TO 3V LOGIC SWING
INTERFACE LINK
3-WIRE SERIAL
pulse and the serial clock at the BCLKR pin to accept an
external positive edge clock. Buffers near the LTC2351-14
may be added to drive long tracks to the DSP to prevent
corruption of the signal to LTC2351-14. This confi guration
is adequate to traverse a typical system board, but source
resistors at the buffer outputs and termination resistors
at the DSP , may be needed to match the characteristic
impedance of very long transmission lines. If you need
to terminate the SDO transmission line, buffer it fi rst with
one or two 74ACxx gates. The TTL threshold inputs of the
DSP port respond properly to the 3V swing used with the
LTC2351-14.
5V
B13
B12
V
BFSR
BCLKR
BDR
TMS320C54x
CC
235114 F07
235114fb