MAX1161 Maxim, MAX1161 Datasheet - Page 7

• Manufacturer Part Number: MAX1161
• Description: 10-Bit / 40Msps / TTL-Output ADC
• Manufacturer: Maxim

VIN is the analog input. The full-scale input range will be
80% of the reference voltage, or ±2V with VFB =
-2.5V and VFT = +2.5V.
The analog input’s drive requirements are minimal
when compared to conventional flash converters. This
is due to the MAX1161’s extremely low (5pF) input
capacitance and very high (300kΩ) input resistance.
For example, for an input signal of ±2Vp-p with a
10MHz input frequency, the peak output current
required for the driving circuit is only 628µA.
Figure 2. Typical Operating Circuit
+5V
+5V
1 F
NOTES:
1) D1 = SCHOTTKY OR HOT CARRIER DIODE
2) FB = FERRITE BEAD, FAIR RITE #2743001111
3) C1–C11 = CHIP CAPACITOR (RECOMMENDED)
4) USE OF A SEPARATE SUPPLY FOR V
5) R5 PROVIDES CURRENT LIMITING TO 45mA.
(TTL)
CLK
(±2V)
0.01 F
VIN
TO BE MOUNTED AS CLOSELY TO THE DEVICE
AS POSSIBLE. THE FERRITE BEAD TO ADC
CONNECTION SHOULD NOT BE SHARED WITH
ANY OTHER DEVICE.
MOUNTED AS CLOSE TO DEVICE'S PIN AS
POSSIBLE.
IS NOT RECOMMENDED.
= AGND
= DGND
2
4
1
10k
VIN
GND
R4
MAX6225
8
3
OP07
7
IC1
IC2
_______________________________________________________________________________________
6
VTRIM
VOUT
0.01 F
2
100
R5
4
6
5
10k
-5.2V
R1
CC
±2.5V MAX
AND DV
30k
30k
R2
R3
1 F
CC
1 F
10-Bit, 40Msps, TTL-Output ADC
2.5V
Analog Input
C1
0.01 F
-2.5V
C5
0.01 F
0.01 F
0.01 F
0.01 F
D1
C4
C2
C3
CLK
VIN
VFT
VST
VRM
VSB
VFB
-5.2V
10 F
0.1 F
0.1 F
C6
C7
R
2R
2R
2R
2R
R
AGND
Figure 3. Analog Equivalent Input Circuit
0.1 F
0.1 F
10 F
C8
C9
INTERPOLATION
INTERPOLATION
SUCCESSIVE
SUCCESSIVE
PRESCALER
STAGE N
COARSE
STAGE 1
ANALOG
ADC
VIN
+5V
0.01 F
0.01 F
C10
C11
4
MAX1161
DGND
V
V
CC
EE
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
FB
(OVERRANGE)
(MSB)
(LSB)
VFT
OUTPUTS
DIGITAL
7