OUTPUT DRIVE
RESOLUTION (Bits)
16
14
13
12
Normally all ADC71 logic outputs will drive two standard
TTL loads; however, if long digital lines must be driver,
external logic buffers are recommended.
Connect Pin 32 to
Open
Pin 15
Pin 14
Pin 13
Maximum Conversion
Speed (µs)(1)
57
50
46.5
43
Maximum Nonlinearity
at 25°C (% of FSR)
0.003(2)
0.003(2)
0.006
0.006
HEAT DISSIPATION
NOTES: (1) Max conversion time to maintain specified nonlinearity error.
(2) BH and KH models only.
The ADC71 dissipates approximately 0.6W (typical) and the
packages have a case-to-ambient thermal resistance (θCA) of
25°C/W. For operation above 85°C, θCA should be lowered
by a heat sink or by forced air over the surface of the
package. See Figure 10 for θCA requirement above 85°C. If
the converter is mounted on a PC card, improved thermal
contact with the copper ground plane under the case can be
achieved using a silicone heat sink compound. On a 0.062"
thick PC card with a 16 square in (min) area, this techniques
will allow operation to 85°C.
TABLE III. Short-Cycle Connections and Specifications for
12- to 14-Bit Resolutions.
25
θ
10
0
60
70
80
90
100
110
125
Ambient Temperature (°C)
FIGURE 10. θCA Requirement Above 85°C.
®
ADC71
8
BB [ BURR-BROWN CORPORATION ]
