參數(shù)資料
型號: TS83102G0BMGS
廠商: E2V TECHNOLOGIES PLC
元件分類: ADC
英文描述: 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CBGA152
封裝: 21 X 21 MM, 1.27 MM PITCH, HERMETIC SEALED, CERAMIC, CGA-152
文件頁數(shù): 36/54頁
文件大?。?/td> 2622K
代理商: TS83102G0BMGS
41
0935B–BDC–06/08
e2v semiconductors SAS 2008
TS83102G0BMGS
9.6
Digital Outputs: Termination and Logic Compatibility
Each single-ended output of the TS83102G0BMGS’s differential output buffers are internally 50
Ω termi-
nated, and feature a 100
Ω differential output impedance. The 50Ω resistors are connected to the
VPLUSD digital power supply. The TS83102G0BMGS output buffers are designed to drive 50
Ω con-
trolled impedance lines properly terminated by a 50
Ω resistor. A 10.5 mA bias current flowing alternately
into one of the 50
Ω resistors when switching, ensures a 0.25V
single-ended voltage drop across the resistor (0.5V differential).
Each single-ended output transmission line length must be kept identical (< 3 mm). Mismatches in the
differential line lengths may cause variations in the output differential common mode.
It is recommended to bypass the midpoint of the differential 100
Ω termination with a 47 pF capacitor, so
as to avoid common mode perturbations in case of a slight mismatch in the differential output line
lengths.
See the recommended termination scenarios in Figures 9-7 and. and Figure 9-8 on page 42.
Note:
Since the output buffers feature a 100
Ω differential output impedance, it is possible to directly drive high
the input impedance storing registers without terminating the 50
Ω transmission lines. Timewise, this means
that the incident wave reflects at the 50
Ω transmission line output and travels back to the 50Ω data output
buffer. Since the buffer output impedance is 50
Ω, no
back reflection occurs and the output swing is doubled.
9.6.0.1
VPLUSD Digital Power Supply Settings
For differential ECL digital output levels: V
PLUSD should be supplied with 0.8V (or connected to
ground via a 5
Ω resistor to ensure the 0.8 voltage drop).
For the LVDS digital output logic compatibility: V
PLUSD should be tied to 1.45V
(±75 mV).
If used with the TS81102G0 DMUX, V
PLUSD can be set to ground.
9.6.1
ECL Differential Output Termination Configurations
Figure 9-7.
50
Ω Terminated Differential Outputs (Recommended)
10.5 mA
Zc = 50
Ω
OUT
VPLUSD = -0.8 V
Zc = 50
Ω
50
Ω
50
Ω
OUTB
50
Ω
50
Ω
VOL typ = -1.17 V
VOH typ = -0.94 V
Differential Output Swing:
±0.23 V = 0.46 Vpp
Common Mode Level = -1.05 V
47 pF
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