MAX2021 datasheet(3/14 Pages) MAXIM

3 / 14 page

High-Dynamic-Range, Direct Up-/Downconversion

750MHz to 1200MHz Quadrature Mod/Demod

_______________________________________________________________________________________

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

RF INPUT

RF Frequency

fRF

750

1200

MHz

Conversion Loss

fBB = 25MHz (Note 7)

9.2

Noise Figure

fLO = 900MHz

9.3

Noise Figure Under-Blocking

NFBLOCK

fBLOCKER = 900MHz, PRF = 11dBm,

fRF = fLO = 890MHz (Note 8)

17.8

Input Third-Order Intercept

IIP3

fRF1 = 925MHz, fRF2 = 926MHz, fLO =

900MHz, PRF = PLO = 0dBm, fSPUR = 24MHz

35.2

dBm

Input Second-Order Intercept

IIP2

fRF1 = 925MHz, fRF2 = 926MHz, fLO =

900MHz, PRF = PLO = 0dBm, fSPUR = 51MHz

dBm

Input 1dB Compression

P1dB

fIF = 50MHz, fLO = 900MHz, PLO = 0dBm

dBm

I/Q Gain Mismatch

fBB = 1MHz, fLO = 900MHz, PLO = 0dBm

0.06

PLO = 0dBm

1.1

I/Q Phase Mismatch

fBB = 1MHz,

fLO = 900MHz

PLO = -3dBm

0.15

degrees

AC ELECTRICAL CHARACTERISTICS (Demodulator)

(MAX2021 Typical Application Circuit when operated as a demodulator, VCC = +4.75V to +5.25V, GND = 0V, differential baseband out-

puts converted to a 50

Ω single-ended output, PRF = PLO = 0dBm, 750MHz ≤ fLO ≤ 1200MHz, 50Ω LO and RF system impedance, R1 =

432

Ω, R2 = 619Ω, R3 = 332Ω, TC = -40°C to +85°C. Typical values are at VCC = +5V, TC = +25°C, unless otherwise noted.) (Notes 1, 2)

AC ELECTRICAL CHARACTERISTICS (Modulator) (continued)

(MAX2021 Typical Application Circuit, VCC = +4.75V to +5.25V, GND = 0V, I/Q differential inputs driven from a 100

Ω DC-coupled

source, 0V common-mode input, PLO = 0dBm, 750MHz

≤ fLO ≤ 1200MHz, 50Ω LO and RF system impedance, R1 = 432Ω, R2 = 619Ω,

R3 = 332

Ω, TC = -40°C to +85°C. Typical values are at VCC = +5V, VBBI = 1.4VP-P differential, VBBQ = 1.4VP-P differential, fIQ = 1MHz,

fLO = 900MHz, TC = +25°C, unless otherwise noted.) (Notes 1, 2)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

ACLR (1st Adjacent Channel

5MHz Offset)

Single-carrier WCDMA (Note 4)

dBc

LO Leakage

No external calibration, with each

baseband input terminated in 50

Ω

-32

dBm

PLO = 0dBm

39.6

Sideband Suppression

No external calibration,

fLO = 920MHz

PLO = -3dBm

43.5

dBc

Output Noise Density

Each baseband input terminated in 50

Ω (Note 5)

-174

dBm/Hz

Output Noise Floor

POUT = 0dBm, fLO = 900MHz (Note 6)

-168

dBm/Hz

RF Return Loss

(Note 3)

Note 1: Guaranteed by design and characterization.

Note 2: TC is the temperature on the exposed paddle.

Note 3: Parameter also applies to demodulator topology.

Note 4: Single-carrier WCDMA with 10.5dB peak-to-average ratio at 0.1% complementary cumulative distribution function,

PRF = -10dBm (PRF is chosen to give -65dBc ACLR).

Note 5: No baseband drive input. Measured with the inputs terminated in 50

Ω. At low output levels, the output noise is thermal.

Note 6: The output noise versus POUT curve has the slope of LO noise (Ln dBc/Hz) due to reciprocal mixing.

Note 7: Conversion loss is measured from the single-ended RF input to single-ended combined baseband output.

Note 8: The LO noise (L = 10(Ln/10)), determined from the modulator measurements can be used to deduce the noise figure under-

blocking at operating temperature (Tp in Kelvin), FBLOCK = 1 + (Lcn - 1) Tp / To + LPBLOCK / (1000kTo), where To = 290K,

PBLOCK in mW, k is Boltzmann’s constant = 1.381 x 10(-23) J/K, and Lcn = 10(Lc/10), Lc is the conversion loss. Noise figure

under-blocking in dB is NFBLOCK = 10 x log (FBLOCK). Refer to Application Note 3632.

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