  We propose a method for generating a spin-squeezed state that is a symmetric
Dicke state, with trapped ions using only global access. The eigenstates of the
ions under a strong dressing field become symmetric Dicke states and the
M$\o$lmer--S$\o$rensen interaction selectively couples one of them to an
initially populated auxiliary state. A $\mid D_{2n}^n>$ state, which is
maximally spin squeezed, can be generated with high fidelity using only square
pulses. Using an adiabatic technique, the ideal maximally spin-squeezed state
is generated.
