MAX1150 Datasheet, PDF (4/8 Pages) Maxim Integrated Products – 8-Bit, 500Msps Flash ADC

8-Bit, 500Msps Flash ADC
______________________________________________________________Pin Description
PIN
1, 2, 3
4, 5, 19, 20, 22, 23, 27, 28, 38, 39,
40, 46, 47, 49, 60, 67, 79
6
7, 9, 11, 54, 56, 58,
69, 71, 73, 75, 77
8
10
12
13, 14, 31, 34, 41, 63, 64
15–18, 25, 26, 29, 30, 36,
37, 44, 45, 51, 52
21
24
32, 33
35
42
43
48
50
53
55
57
59, 61, 62, 65, 66, 68
70
72
74
76
78
80
NAME
D2B, D3B, D4B
VEE
D5B
DGND
D6B
D7B
D8B
N.C.
AGND
VRBF
VRBS
VIN
VRM
VRTF
VRTS
NCLK
CLK
DRA
NDRA
D0A
D1A–D6A
D7A
D8A
NDRB
DRB
D0B
D1B
FUNCTION
Data Output Bank, Bits 2, 3, and 4
Negative Supply, nominally -5.2V
Data Output Bank B, Bit 5
Digital Ground
Data Output Bank B, Bit 6
Data Output Bank B, Bit 7 (MSB)
Data Output Bank B, Bit 8 (OVR)
No Connection. Not internally connected.
Analog Ground
Reference-Voltage Force Bottom
Reference-Voltage Sense Bottom
Analog Input Voltage. Can be either voltage or sense.
Reference-Voltage Middle, nominally -1V
Reference-Voltage Force Top
Reference-Voltage Sense Top
Inverse Clock Input
Clock Input
Data Ready Bank A
Not Data Ready Bank A
Data Output Bank A, Bit 0 (LSB)
Data Output Bank A, Bits 1–6
Data Output Bank A, Bit 7 (MSB)
Data Output Bank A, Bit 8 (OVR)
Not Data Ready Bank B
Data Ready Bank B
Data Output Bank B, Bit 0 (LSB)
Data Output Bank B, Bit 1
_______________Detailed Description
The MAX1150 is one of the fastest monolithic, 8-bit, par-
allel, flash analog-to-digital converters (ADCs) available
today. The nominal conversion rate is 500Msps, and the
analog bandwidth is in excess of 900MHz. A major
advance over previous flash converters is the inclusion
of 255 input preamplifiers between the reference ladder
and input comparators (see Functional Diagram). This
not only reduces clock transient kickback to the input
and reference ladder, but also reduces the effect of the
input signal’s dynamic state on the input comparators’
latching characteristics. The preamplifiers act as buffers
to stabilize the input capacitance so that it remains con-
stant over different input voltage and frequency ranges,
making the part easier to drive than previous flash con-
verters. The preamplifiers also add a gain of +2 to the
input signal, so that each comparator has a wider over-
drive or threshold range to trip into or out of the active
state. This gain reduces metastable states that can
cause errors at the output.
4 _______________________________________________________________________________________