參數(shù)資料
型號(hào): LTC1276ACSW#TR
廠商: Linear Technology
文件頁(yè)數(shù): 11/24頁(yè)
文件大?。?/td> 0K
描述: IC ADC 12BIT SAMPLING REF 24SOIC
標(biāo)準(zhǔn)包裝: 1,000
位數(shù): 12
采樣率(每秒): 300k
數(shù)據(jù)接口: 并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 75mW
電壓電源: 雙 ±
工作溫度: 0°C ~ 70°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 24-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 24-SOIC
包裝: 帶卷 (TR)
輸入數(shù)目和類(lèi)型: 1 個(gè)單端,單極;1 個(gè)單端,雙極
19
LTC1273
LTC1275/LTC1276
127356fa
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
TMS320C25
Figure 17 shows an interface between the LTC1273 and
the TMS320C25.
The W/R signal of the DSP initiates a conversion and
conversion results are read from the LTC1273 using the
following instruction:
IN
D, PA
where D is Data Memory Address and PA is the PORT
ADDRESS.
Figure 17. TMS320C25 Interface
DATA BUS
LTC1273/75/76 F17
ADDRESS BUS
D0
D16
R/W
READY
IS
A1
A16
TMS320C25
ADDRESS
DECODE
EN
D0/8
D11
RD
BUSY
CS
HBEN
LTC1273/75/76
ADDITIONAL PINS OMITTED FOR CLARITY
DATA BUS
LTC1273/75/76 F18
ADDRESS BUS
D0
D11
R/W
DTACK
AS
A1
A23
MC68000
ADDRESS
DECODE
EN
D0/8
D11
RD
BUSY
CS
HBEN
LTC1273/75/76
ADDITIONAL PINS OMITTED FOR CLARITY
Figure 18. MC68000 Interface
8085A/Z80 Microprocessor
Figure 19 shows an LTC1273 interface for the Z80/8085A.
The LTC1273 is operating in the Slow Memory Mode and
a two byte read is required. Not shown in the figure is the
8-bit latch required to demultiplex the 8085A common
address/data bus. A0 is used to assert HBEN so that an
even address (HBEN = LOW) to the LTC1273 will start a
conversion and read the low data byte. An odd address
(HBEN = HIGH) will read the high data byte. This is
accomplished with the single 16-bit LOAD instruction
below.
For the 8085A
LHLD (B000)
For the Z80
LDHL, (B000)
Figure 19. 8085A and Z80 Interface
DATA BUS
LTC1273/75/76 F19
ADDRESS BUS
D0
D7
RD
WAIT
MREQ
A0
A15
Z80
8085A
ADDRESS
DECODE
EN
D0/8
D7
RD
BUSY
CS
HBEN
ADDITIONAL PINS OMITTED FOR CLARITY
LTC1273/75/76
A0
MC68000 Microprocessor
Figure 18 shows a typical interface for the MC68000. The
LTC1273 is operating in the Slow Memory Mode. Assum-
ing the LTC1273 is located at address C000, then the
following single 16-bit MOVE instruction both starts a
conversion and reads the conversion result:
Move.W $C000,D0
At the beginning of the instruction cycle when the ADC
address is selected, BUSY and CS assert DTACK so that
the MC68000 is forced into a WAIT state. At the end of
conversion, BUSY returns high and the conversion result
is placed in the D0 register of the microprocessor.
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