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參數(shù)資料
| 型號： | LTC6912HGN-1#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PGA DIGITAL R-R DUAL 16SSOP |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 放大器類型： | 可編程增益 |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 26 V/µs |
| 增益帶寬積： | 33MHz |
| 電壓 - 輸入偏移： | 125µV |
| 電流 - 電源： | 2.25mA |
| 電流 - 輸出 / 通道： | 35mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 10.5 V，±2.7 V ~ 5.25 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 管件 |
LTC6912
20
6912fa
APPLICATIO S I FOR ATIO
WU
UU
Figure 6. Two LTC6912s (Four PGAs) in Daisy Chain Configuration
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC6912-X
0.1
F
0.1
F
V+
V–
DIGITAL GROUND PLANE
ANALOG GROUND PLANE
6912 F06
DGND
DOUT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC6912-X
0.1
F
0.1
F
V+
V–
DGND
DOUT
CS/LD
DATA
CLK
P
SINGLE-POINT
SYSTEM GND
D15
D11
D10
D9
D8
D7
D3
D2
D1
D0
CLK
DIN
CS/LD
SHDN
CS/LD
DIN
SHDN
CS/LD
DIN
configuration. It is recommended the serial interface sig-
nals should remain idle in between data transfers in order
to minimize digital noise coupling into the analog path.
Power On Reset
On the initial application of power, the power on reset
state of both amplifiers is low power software shutdown
(state = 8) (see Tables 1 and 2). In this state, both analog
amplifiers are disabled and have their inputs and outputs
opened. This will facilitate the application of using the
device as a 2:1 analog MUX, in that the amplifier’s outputs
may be wired-OR together and the LTC6912 can alter-
nately select between A and B channels. Care must be
taken if the outputs are wired-OR’d to ensure the software
shutdown state (state = 8) is always programmed in one
of the two channels.
Timing Constraints
Settling time in the CMOS gain-control logic is typically
several nanoseconds and is faster than the analog signal
path. When the amplifier gain changes, the limiting timing
is analog. As with any programmable-gain amplifier, each
gain change causes an output transient as the amplifier’s
output moves, with finite speed, toward a differently
scaled version of the input signal. The LTC6912-X analog
path settles with a characteristic time constant or time
scale,
τ, that is roughly the standard value for a first order
band limited response:
τ = 0.35/f–3dB
See the –3dB BW vs Gain Setting graph in the Typical
Performance Characteristics section.
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