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參數(shù)資料
| 型號： | AD7880BR |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/16頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT LC2MOS 5V LP 24SOIC |
| 標準包裝： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 66k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉換器數(shù)目： | 1 |
| 功率耗散（最大）： | 50mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 24-SOIC W |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 2 個單端，單極；2 個單端，雙極 |
AD7880
–10–
REV. 0
a write operation starts a conversion. Data is read at the end of
the conversion sequence as before. Figure 19 shows an example
of initiating conversion using this method. A similar implemen-
tation can be used for DSPs. Note that for all interfaces, a read
operation should not be attempted during conversion.
AD7880–MC68000 Interface
An interface between the AD7880 and the MC68000 is shown
in Figure 18. As before, conversion is initiated using an external
timer. The AD7880 BUSY line can be used to interrupt the
processor or, alternatively, software delays can ensure that con-
version has been completed before a read to the AD7880 is at-
tempted. Because of the nature of its interrupts, the 68000
requires additional logic (not shown in Figure 18) to allow it to
be interrupted correctly. For further information on 68000 in-
terrupts, consult the 68000 users manual.
The MC68000 AS and R/W outputs are used to generate a
separate RD input signal for the AD7880. CS is used to drive
the 68000 DTACK input to allow the processor to execute a
normal read operation to the AD7880. The conversion results
are read using the following 68000 instruction:
MOVE.W ADC, D0
where D0 is the 68000 D0 register
where ADC is the AD7880 address
A0
A15
D15
D0
ADDR
DECODE
ADDRESS BUS
DATA BUS
CONVST
CS
DB11
DB0
RD
AD7880*
MC68000
*ADDITIONAL PINS OMITTED FOR CLARITY
R/W
AS
EN
DTACK
TIMER
Figure 18. AD7880–MC68000 Interface
AD7880–8086 Interface
Figure 19 shows an interface between the AD7880 and the
8086 microprocessor. Unlike the previous interface examples,
the microprocessor initiates conversion. This is achieved by gat-
ing the 8086 WR signal with a decoded address output (differ-
ent to the AD7880 CS address). Conversion is initiated and the
result is read from the AD7880 using the following instruction:
MOV AX, ADC
where AX is the 8086 accumulator and
where ADC is the AD7880 address
AD15
AD0
ADDR
DECODE
ADDRESS BUS
ADDRESS/DATA BUS
CONVST
CS
DB11
DB0
RD
AD7880*
8086
*ADDITIONAL PINS OMITTED FOR CLARITY
WR
RD
LATCH
ALE
Figure 19. AD7880–8086 Interface
AD7880–6809 Interface
The AD7880 can also interface quite easily with 8-bit micro-
processors. The 12-bit parallel data output from the AD7880
can be read into the microprocessor as an 8+4 byte structure.
Figure 20 shows an interface to the MC6809 8-bit microproces-
sor. As in previous cases, conversion is initiated using an exter-
nal timer. At the end of conversion, BUSY triggers a one-shot
which drives the IRQ interrupt input of the microprocessor. A
double read is then performed to two unique addresses. The
first read fetches the lower 8 bits (DB0–DB7) and loads the
74HC374 latch with the upper 4 bits (DB8–DB11). The sec-
ond read fetches these upper 4 bits.
A0
A15
D7
D0
ADDR
DECODE
ADDRESS BUS
TIMER
DATA BUS
CONVST
CS
DB7
DB0
RD
AD7880*
MC6809
*ADDITIONAL PINS OMITTED FOR CLARITY
R/W
IRQ
E
BUSY
ONE
SHOT
Q3
Q0
CLK
D3
D0
74HC374
OE
DB8
DB11
Figure 20. AD7880–6809 Interface
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