mid supply (V
參數(shù)資料
型號(hào)： MAX1198ECM+D
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 5/22頁(yè)
文件大?。?/td> 0K
描述： IC ADC 8BIT 100MSPS DUAL 48-TQFP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 250
位數(shù)： 8
采樣率（每秒）： 100M
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 314mW
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： 48-TQFP 裸露焊盤
供應(yīng)商設(shè)備封裝： 48-TQFP 裸露焊盤（7x7）
包裝： 托盤
輸入數(shù)目和類型： 4 個(gè)單端，雙極；2 個(gè)差分，雙極
產(chǎn)品目錄頁(yè)面： 1396 (CN2011-ZH PDF)
Match the impedance of INA+ and INA-, as well as
INB+ and INB-, and set the common-mode voltage to
mid supply (VDD/2) for optimum performance.
Analog Inputs and Reference
Configurations
The full-scale range of the MAX1198 is determined by
the internally generated voltage difference between
REFP (VDD/2 + VREFIN/4) and REFN (VDD/2 - VREFIN/4).
The full-scale range for both on-chip ADCs is
adjustable through the REFIN pin, which is provided for
this purpose.
The MAX1198 provides three modes of reference operation:
Internal reference mode
Buffered external reference mode
Unbuffered external reference mode
In internal reference mode, connect the internal refer-
ence output REFOUT to REFIN through a resistor (e.g.,
10k
) or resistor-divider, if an application requires a
reduced full-scale range. For stability and noise-filtering
purposes, bypass REFIN with a >10nF capacitor to
GND. In internal reference mode, REFOUT, COM,
REFP, and REFN become low-impedance outputs.
In buffered external reference mode, adjust the refer-
ence voltage levels externally by applying a stable and
accurate voltage at REFIN. In this mode, COM, REFP,
and REFN are outputs. REFOUT can be left open or
connected to REFIN through a >10k
resistor.
In unbuffered external reference mode, connect REFIN
to GND. This deactivates the on-chip reference buffers
for REFP, COM, and REFN. With their buffers shut
down, these nodes become high-impedance inputs
and can be driven through separate, external reference
sources.
For detailed circuit suggestions and how to drive this
dual ADC in buffered/unbuffered external reference
mode, see the Applications Information section.
Clock Input (CLK)
The MAX1198’s CLK input accepts a CMOS-compati-
ble clock signal. Since the interstage conversion of the
device depends on the repeatability of the rising and
falling edges of the external clock, use a clock with low
jitter and fast rise and fall times (<2ns). In particular,
sampling occurs on the rising edge of the clock signal,
requiring this edge to provide lowest possible jitter. Any
significant aperture jitter would limit the SNR perfor-
mance of the on-chip ADCs as follows:
where fIN represents the analog input frequency and
tAJ is the time of the aperture jitter.
Clock jitter is especially critical for undersampling
applications. The clock input should always be consid-
ered as an analog input and routed away from any ana-
log input or other digital signal lines.
SNR
ft
IN
AJ
log
=×
××
×
20
1
2
π
MAX1198
Dual, 8-Bit, 100Msps, 3.3V, Low-Power ADC
with Internal Reference and Parallel Outputs
______________________________________________________________________________________
13
N - 6
N
N - 5
N + 1
N - 4
N + 2
N - 3
N + 3
N - 2
N + 4
N - 1
N + 5
N
N + 6
N + 1
5-CLOCK-CYCLE LATENCY
ANALOG INPUT
CLOCK INPUT
DATA OUTPUT
D7A–D0A
tDO
tCH
tCL
N - 6
N - 5
N - 4
N - 3
N - 2
N - 1
N
N + 1
DATA OUTPUT
D7B–D0B
tAD
Figure 3. System Timing Diagram
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