HI1171 데이터 시트보기 (PDF) - Renesas Electronics
부품명
상세내역
제조사
HI1171 Datasheet PDF : 7 Pages
| |||
HI1171
Pin Descriptions (Continued)
24 PIN
SOIC
21
23, 24
PIN
NAME
IOUT2
DVDD
PIN DESCRIPTION
Current Output pin used for a virtual ground connection. Usually connected to AVSS.
Digital Supply 4.75V to 7V.
Detailed Description
The HI1171 is an 8-bit, current out D/A converter. The DAC
can convert at 40MHz and run on a single +5V supply. The
architecture is an encoded, switched current cell arrangement.
Voltage Output Mode
The output current of the HI1171 can be converted into a voltage
by connecting an external resistor to IOUT1. To calculate the
output resistor use the following equation:
ROUT = VFS /IFS,
where VFS can range from +0.5V to +2.0V and IFS can range
from 0mA to 15mA.
In setting the output current the IREF pin should have a resistor
connected to it that is 16 times greater than the output resistor:
RREF = 16 x ROUT
As the values of both ROUT and RREF increase, power
consumption is decreased, but glitch energy and output
settling time is increased.
Clock Phase Relationship
The internal latch is closed when the clock line is high. The
latch can be cleared by the BLNK line. When BLNK is set
(HIGH) the contents of the internal data latch will be cleared.
When BLNK is low data is updated by the CLK.
Noise Reduction
To reduce power supply noise separate analog and digital
power supplies should be used with 0.1F ceramic capacitors
placed as close to the body of the HI1171 as possible. The
analog (AVSS) and digital (DVSS) ground returns should be
connected together back at the power supply to ensure proper
operation from power up.
Test Circuits
8-BIT
COUNTER
WITH LATCH
CLK
40MHz
SQUARE WAVE
(LSB) D0
1
2
D7
8
BLK
9
0.1F
11
VB
CLK 12
IO
20
VG
17
0.1F
VREF
16
2V
IREF
15
AVDD
OSCILLOSCOPE
200
1k
AVSS
3.3k
FIGURE 5. MAXIMUM CONVERSION SPEED TEST CIRCUIT
© Copyright Intersil Americas LLC 1997-2005. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such
modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are
current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its
subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN3662 Rev.3.00
October 26, 2005
Page 6 of 7
Share Link: 