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參數(shù)資料
| 型號： | 2486 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit 2-/4-Channel ツヒ ADC with PGA and Easy Drive Input Current Cancellation |
| 中文描述： | 16位2-/4-ChannelツヒADC，帶PGA和簡易輸入電流驅(qū)動取消 |
| 文件頁數(shù)： | 24/36頁 |
| 文件大?。?/td> | 596K |
| 代理商： | 2486 |
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LTC2486
24
2486f
APPLICATIONS INFORMATION
On the falling edge of
E
O
C, the conversion result is load-
ing into an internal static shift register. The output data
can now be shifted out the SDO pin under control of the
externally applied SCK signal. Data is updated on the fall-
ing edge of SCK. The input data is shifted into the device
through the SDI pin on the rising edge of SCK. On the
24th falling edge of SCK, SDO goes HIGH, indicating a
new conversion has begun. This data now serves as
E
O
C
for the next conversion.
Internal Serial Clock, Single Cycle Operation
This timing mode uses the internal serial clock to shift out
the conversion result and
C
S to monitor and control the
state of the conversion cycle (see Figure 9).
In order to select the internal serial clock timing mode,
the serial clock pin (SCK) must be floating or pulled HIGH
before the conclusion of the POR cycle and prior to each
falling edge of
C
S. An internal weak pull-up resistor is active
on the SCK pin during the falling edge of
C
S; therefore,
the internal SCK mode is automatically selected if SCK is
not externally driven.
The serial data output pin (SDO) is Hi-Z as long as
C
S is
HIGH. At any time during the conversion cycle,
C
S may be
pulled low in order to monitor the state of the converter.
Once
C
S is pulled LOW, SCK goes LOW and
E
O
C is output
to the SDO pin.
E
O
C = 1 while the conversion is in progress
and
E
O
C = 0 if the device is in the sleep state.
When testing
E
O
C, if the conversion is complete (
E
O
C =
0), the device will exit sleep state. In order to return to the
sleep state and reduce the power consumption,
C
S must be
pulled HIGH before the device pulls SCK HIGH. When the
device is using its own internal oscillator (F
O
is tied LOW),
the first rising edge of SCK occurs 12μs (t
EOCTEST
= 12μs)
after the falling edge of
C
S. If F
O
is driven by an external
oscillator of frequency f
EOSC
, then t
EOCTEST
= 3.6/f
EOSC
.
If
C
S remains LOW longer than t
EOCTEST
, the first rising
edge of SCK will occur and the conversion result is shifted
out the SDO pin on the falling edge of SCK. The serial
input word (SDI) is shifted into the device on the rising
edge of SCK.
After the 24th rising edge of SCK a new conversion au-
tomatically begins. SDO goes HIGH (
E
O
C = 1) and SCK
Figure 9. Internal Serial Clock, Single Cycle Operation
Hi-Z
2486 F09
CS
SCK
(INTERNAL)
SDI
SDO
CONVERSION
SLEEP
DATA INPUT/OUTPUT
V
CC
F
O
SCK
SDI
GND
REFERENCE
VOLTAGE
0.1V TO V
CC
ANALOG
INPUTS
= EXTERNAL OSCILLATOR
= INTERNAL OSCILLATOR
LTC2486
4-WIRE
SPI INTERFACE
EOC
BIT 20 BIT 19 BIT 18 BIT 17 BIT 16 BIT 15 BIT 14 BIT 13
BIT 12 BIT 11
BIT 21
BIT 22
BIT 23
BIT 10
BIT 9
BIT 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
24
1
0
EN
SGL
A2
A1
A0
EN2
IM
FA
FB
SPD
GS2
GS1
GS0
ODD
DON'T CARE
DON'T CARE
MSB
SIG
“0”
OPTIONAL
10k
V
CC
<t
EOCTEST
REF
+
REF
–
CH0
CH1
CH2
CH3
COM
CS
12
1
13
14
8
9
10
11
7
3
4
6
5
2
2.7V TO 5.5V
0.1
μ
F
10
μ
F
SDO
CONVERSION
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 2486 01 | 制造商:Lumberg Connect GmbH 功能描述:MINI USB TYPE B RECEPTACLE SMT 制造商:LUMBERG 功能描述:MINI USB TYPE B, RECEPTACLE, SMT 制造商:LUMBERG 功能描述:MINI USB CONNECTOR, RCPT, 5POS, SOLDER; Connector Type:USB Mini B; Series:-; Gender:Receptacle; No. of Contacts:5; Contact Termination:Surface Mount Right Angle; Connector Mounting:PCB; Contact Plating:Gold; Voltage AC:5V ;RoHS Compliant: Yes 制造商:Lumberg 功能描述:Conn Mini USB Type B PL 5 POS Solder RA SMD 5 Terminal 1 Port Bulk |
| 2486 01 VP3 | 制造商:Lumberg Connect GmbH 功能描述:Conn Mini USB Type B PL 5 POS Solder RA SMD 5 Terminal 1 Port Bulk |
| 2486 03 VP3 | 制造商:Lumberg 功能描述:CONN MINI USB TYPE B PL 5 POS SOLDER RA SMD 5 TERMINAL 1 PORT BULK USB 2.0 |
| 24-8600-310C | 功能描述:IC 與器件插座 ELEV. SCKT .3 CENTER COLLET 24 PINS RoHS:否 制造商:Molex 產(chǎn)品:LGA Sockets 節(jié)距:1.02 mm 排數(shù): 位置/觸點(diǎn)數(shù)量:2011 觸點(diǎn)電鍍:Gold 安裝風(fēng)格:SMD/SMT 端接類型:Solder 插座/封裝類型:LGA 2011 工作溫度范圍:- 40 C to + 100 C |
| 24-8600-610C | 功能描述:IC 與器件插座 ELEV. SCKT .3 CENTER COLLET 24 PINS RoHS:否 制造商:Molex 產(chǎn)品:LGA Sockets 節(jié)距:1.02 mm 排數(shù): 位置/觸點(diǎn)數(shù)量:2011 觸點(diǎn)電鍍:Gold 安裝風(fēng)格:SMD/SMT 端接類型:Solder 插座/封裝類型:LGA 2011 工作溫度范圍:- 40 C to + 100 C |
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